release: v0.3.3 — Windows x64, macOS v145, auto-spoof docs

Bump wrapper to 0.3.3. Update README fingerprint section to
document auto-spoof behavior (zero-config stealth). Improve
reCAPTCHA test with wait_for_selector instead of blind sleep.

.github/workflows/release-binary.yml

@@ -0,0 +1,45 @@
+name: Release Binary
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Release tag (e.g. chromium-v145.0.7718.0)'
+        required: true
+      title:
+        description: 'Release title (e.g. Chromium v145 — Stealth Build)'
+        required: true
+        default: 'Stealth Chromium Build'
+      patch_count:
+        description: 'Number of fingerprint patches'
+        required: true
+        default: '16'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Create release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ github.event.inputs.tag }}
+          name: "${{ github.event.inputs.title }}"
+          body: |
+            ## Stealth Chromium Build
+
+            Pre-built Chromium with ${{ github.event.inputs.patch_count }} source-level fingerprint patches.
+
+            ### Install
+            ```bash
+            pip install cloakbrowser    # Python
+            npm install cloakbrowser    # JavaScript
+            # Binary auto-downloads on first launch
+            ```
+
+            > Binary integrity is verified automatically via SHA-256 checksums on download.
+            >
+            > Release signed with CloakHQ GPG key: `C60C0DDC9D0DE2DD`

.gitignore

@@ -37,6 +37,10 @@ htmlcov/
 CLAUDE.md
 .claude/
 
+# JavaScript / Node.js
+js/node_modules/
+js/dist/
+
 # Distribution
 *.tar.gz
 *.whl
@@ -45,3 +49,15 @@ AGENTS.md
 
 # Private docs (launch posts, strategy)
 docs/
+
+# Internal test infrastructure (Docker, VPS-specific)
+test-infra/
+
+# Website (deployed separately)
+site/
+
+# Release scripts
+publish.sh
+deploy.sh
+.env
+debug

BINARY-LICENSE.md

@@ -0,0 +1,95 @@
+# CloakBrowser Binary License
+
+**Version 1.0 — February 2026**
+
+Copyright (c) 2026 CloakHQ. All rights reserved.
+
+This license applies to the compiled CloakBrowser Chromium binary ("Binary") distributed via GitHub Releases and cloakbrowser.dev. It does **not** apply to the wrapper source code in this repository, which is licensed under the [MIT License](LICENSE).
+
+By downloading, installing, or using the Binary, you agree to be bound by the terms of this license.
+
+## Intellectual Property
+
+The Binary is built on Chromium, which is open-source software by The Chromium Authors under the BSD 3-Clause License, and incorporates components from the open-source ungoogled-chromium project. CloakHQ's build configuration, patches, and the Binary as a combined work are the proprietary property of CloakHQ. This license governs the Binary as distributed by CloakHQ — it does not restrict rights granted by upstream open-source licenses to their respective components.
+
+## Grant of Use
+
+You are granted a non-exclusive, non-transferable, royalty-free license to use the Binary for personal or commercial purposes. No fees are required.
+
+## Restrictions
+
+You may NOT:
+
+1. **Redistribute** the Binary, in whole or in part, whether modified or unmodified
+2. **Resell, sublicense, or repackage** the Binary, or include it in any product or service distributed to third parties
+3. **Reverse engineer, decompile, or disassemble** the Binary, or attempt to derive source code from it, except to the extent permitted by applicable law
+4. **Modify** the Binary or create derivative works based on it
+5. **Remove or alter** any copyright notices, license files, or attribution included with the Binary
+
+Listing CloakBrowser as a dependency in your project (e.g., in `requirements.txt`, `package.json`, or documentation) is not redistribution — end users download the Binary directly from official CloakHQ channels.
+
+Internal caching or mirroring (including via artifact repositories such as Artifactory or Nexus) of unmodified Binaries that were originally obtained from official CloakHQ distribution channels is permitted solely for internal operational purposes within your organization. This permission does not allow public redistribution or distribution to third parties.
+
+## Official Distribution
+
+The Binary must originally be obtained from official CloakHQ distribution channels, including GitHub Releases (github.com/CloakHQ/CloakBrowser) and cloakbrowser.dev. Internal organizational mirrors permitted under the Restrictions section are not considered unauthorized sources.
+
+## Trademark Notice
+
+This license does not grant you any right to use the CloakHQ or CloakBrowser name, logo, or trademarks, except for nominative use reasonably necessary to refer to CloakHQ or CloakBrowser.
+
+## Attribution
+
+Attribution is appreciated but not required. If you'd like to credit CloakBrowser, a "Powered by CloakBrowser" notice with a link to https://github.com/CloakHQ/CloakBrowser in your documentation, README, or about page is welcome.
+
+## Acceptable Use
+
+You are solely responsible for how you use the Binary. You agree NOT to use the Binary for any activity that violates applicable laws or regulations in your jurisdiction. CloakHQ does not endorse, encourage, or support any illegal use.
+
+## Indemnification
+
+You agree to indemnify and hold harmless CloakHQ and its contributors from any claims, damages, losses, liabilities, and expenses (including reasonable legal fees) arising from your unlawful use of the Binary or your violation of this license.
+
+## Disclaimer
+
+THE BINARY IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE BINARY OR THE USE OR OTHER DEALINGS IN THE BINARY.
+
+## Data Collection
+
+CloakHQ does not intentionally include telemetry, analytics, or tracking mechanisms in the Binary. The Binary is built on ungoogled-chromium, which removes Google-specific services and telemetry. Any network activity may result from normal browser operation, Chromium subsystems, user configuration, extensions, or the web pages and services you access, and not from any telemetry or analytics service operated by CloakHQ.
+
+## Updates
+
+CloakHQ is under no obligation to provide updates, patches, new versions, or support for the Binary. Updates, when provided, are subject to the terms of this license.
+
+## Termination
+
+This license terminates automatically if you violate any of its terms. Upon termination, you must destroy all copies of the Binary in your possession. The Intellectual Property, Restrictions, Trademark Notice, Indemnification, Disclaimer, Governing Law, Reservation of Rights, Entire Agreement, No Waiver, Assignment, and Severability sections survive termination.
+
+## Governing Law
+
+This license is governed by the laws of the jurisdiction in which CloakHQ is established. Any disputes arising under this license shall be subject to the exclusive jurisdiction of the courts in that jurisdiction.
+
+## Reservation of Rights
+
+All rights not expressly granted under this license are reserved by CloakHQ.
+
+## Entire Agreement
+
+This license constitutes the entire agreement between you and CloakHQ regarding the Binary and supersedes any prior or contemporaneous understandings relating to the Binary.
+
+## No Waiver
+
+Failure by CloakHQ to enforce any provision of this license does not constitute a waiver of that provision or any other provision.
+
+## Assignment
+
+You may not assign or transfer this license or any rights under it without prior written consent from CloakHQ.
+
+## Severability
+
+If any provision of this license is held to be unenforceable or invalid, that provision shall be modified to the minimum extent necessary to make it enforceable, and all remaining provisions shall continue in full force and effect.
+
+## Contact
+
+For licensing inquiries, including redistribution or OEM licensing, contact cloakhq@pm.me.

CHANGELOG.md

@@ -0,0 +1,149 @@
+# Changelog
+
+All notable changes to CloakBrowser — wrapper and binary — are documented here.
+
+Changes are tagged: **[wrapper]** for Python/JS wrapper, **[binary]** for Chromium patches.
+
+---
+
+## [0.3.3] — 2026-03-03
+
+All platforms now run Chromium 145 v2 with 25 patches. Windows x64 added.
+
+- **[binary]** Auto-spoof by default — binary is stealthy with zero flags. Random fingerprint seed auto-generated at startup, no wrapper or configuration required
+- **[binary]** Platform-aware auto-detection — GPU, screen dimensions, and User-Agent automatically match the real OS (macOS, Linux, Windows) without explicit flags
+- **[binary]** Expanded GPU model database for realistic per-session diversity
+- **[binary]** First macOS v145 builds (arm64 + x64) — 25 patches, up from 16 on v142
+- **[binary]** First Windows x64 v145 build — 25 patches
+- **[wrapper]** Add Windows x64 platform support — auto-download, binary path resolution, and platform detection
+- **[wrapper]** Upgrade macOS (arm64 + x64) from Chromium 142 to 145 — all platforms now ship the same 25-patch build
+- **[wrapper]** Add explicit Mac GPU flags (`Apple M3 Metal` renderer) to default stealth args for consistent WebGL fingerprints
+- **[wrapper]** Improve reCAPTCHA stealth test — wait for score element instead of blind sleep
+- **[wrapper]** JS: add `win32-x64` platform mapping, Windows binary path (`chrome.exe`)
+
+## [0.3.1] — 2026-03-03
+
+- **[wrapper]** Auto-check for wrapper updates on startup (PyPI/npm). Notifies users when a newer wrapper version is available. Runs once per process, respects `CLOAKBROWSER_AUTO_UPDATE=false`.
+
+---
+
+## [0.3.0] — 2026-03-02
+
+Chromium v145 upgrade. 25 fingerprint patches (up from 16). New download verification and fallback system. macOS v145 binary builds pending.
+
+### Breaking
+
+- **[wrapper]** Python dependency changed from `playwright` to `patchright` (CDP stealth fork). Patchright is API-compatible, but if you import `playwright` directly elsewhere, add it as a separate dependency. Replace `from playwright.sync_api` with `from patchright.sync_api` (or keep using `cloakbrowser.launch()` which handles this automatically).
+- **[wrapper]** `launch_context()` / `launchContext()` now defaults viewport to 1920×947 (realistic maximized Chrome on 1080p Windows with 48px taskbar) instead of Playwright's default 1280×720. Pass `viewport={"width": 1280, "height": 720}` explicitly to restore old behavior.
+
+### 2026-03-02
+
+- **[binary]** Full stealth audit — multiple detection vectors eliminated, improved cross-API consistency
+- **[binary]** Platform-aware fingerprint defaults: screen dimensions, taskbar, and layout auto-adjust per spoofed platform
+- **[binary]** Stability and performance improvements across fingerprint patches
+- **[binary]** New optional flags: `--fingerprint-fonts-dir`, `--fingerprint-taskbar-height`
+- **[wrapper]** Sync wrapper with latest binary changes: updated flag names, viewport, and defaults
+- **[wrapper]** Per-platform Chromium versioning — Linux and macOS can track different binary versions independently
+- **[wrapper]** Improved SHA-256 checksum verification and version marker migration
+
+### 2026-03-01
+
+- **[wrapper]** Upgrade wrapper to Chromium v145.0.7632.109
+- **[wrapper]** Add GitHub Releases fallback when primary download mirror is unavailable
+- **[wrapper]** Add SHA-256 checksum verification for binary downloads
+- **[wrapper]** Wire timezone and locale params to Chromium binary flags
+- **[wrapper]** Add device memory to default stealth args
+- **[wrapper]** JS: add `colorScheme` support, guard download fallback against partial failures
+
+### 2026-02-28
+
+- **[binary]** Enforce strict flag discipline — patches only activate when explicitly configured via command-line flags
+- **[binary]** Improved fingerprint consistency across multiple browser APIs
+- **[binary]** 3 new fingerprint patches + bug fixes in existing patches
+- **[binary]** New command-line flag for device memory spoofing
+- **[infra]** Automated test matrix: 8 groups, 41+ tests across core stealth, fingerprint noise, bot detection, reCAPTCHA, TLS, Turnstile, residential proxy, and enterprise reCAPTCHA
+- **[infra]** Docker-based test runner with subprocess isolation per test group
+
+### 2026-02-25
+
+- **[binary]** Reduced automation markers visible to detection scripts
+- **[binary]** Added browser API support at build time
+- **[binary]** Improved screen property consistency
+
+### 2026-02-24
+
+- **[binary]** Comprehensive fingerprint audit and hardening pass
+- **[binary]** Fixed font rendering edge case on cross-platform spoofing
+- **[binary]** 4 new fingerprint patches
+
+### 2026-02-22
+
+- **[binary]** Start Chromium v145 build (v145.0.7632.109)
+- **[binary]** 24 fingerprint patches ported and adapted
+
+---
+
+## [0.2.2] — 2026-03-01
+
+### 2026-03-01
+
+- **[wrapper]** Fix: replace `page.wait_for_timeout()` with `time.sleep()` to avoid timing leak
+- **[wrapper]** Add auto-detect timezone and locale from proxy IP via GeoIP lookup
+- **[binary]** CDP detection vector audit and hardening
+
+---
+
+## [0.2.0] — 2026-02-27
+
+macOS platform release. JavaScript/TypeScript wrapper. Self-hosted binary mirror.
+
+### 2026-02-27
+
+- **[wrapper]** Add macOS support: Apple Silicon (arm64) and Intel (x64) binary downloads
+- **[wrapper]** Add GPG-signed release workflow via GitHub Actions
+- **[wrapper]** Fix macOS binary download: preserve `.app` symlinks, remove quarantine xattrs
+- **[wrapper]** Add real bot detection assertions to stealth tests
+- **[wrapper]** Bump version to 0.2.0
+
+### 2026-02-26
+
+- **[wrapper]** Switch binary downloads to self-hosted mirror (`cloakbrowser.dev`) as GitHub backup
+- **[wrapper]** Set up GitLab mirror at `gitlab.com/CloakHQ/cloakbrowser`
+
+### 2026-02-25
+
+- **[wrapper]** Move binary releases from separate repo to wrapper repo
+- **[wrapper]** Add auto-update check on launch
+- **[infra]** Initial Docker test infrastructure + matrix test runner
+
+### 2026-02-24
+
+- **[wrapper]** Add JavaScript/TypeScript wrapper with Playwright + Puppeteer support (`npm install cloakbrowser`)
+- **[wrapper]** Fix proxy authentication credentials support in URL (closes #4)
+
+---
+
+## [0.1.4] — 2026-02-23
+
+### 2026-02-23
+
+- **[wrapper]** Stealth hardening: additional launch args and detection evasion improvements
+- **[wrapper]** Full test suite rewrite with real detection site assertions
+- **[wrapper]** Add Docker support with Dockerfile and compose config
+- **[wrapper]** Add headed mode documentation
+
+---
+
+## [0.1.0] — 2026-02-22
+
+Initial release. Chromium v142 with 16 fingerprint patches.
+
+### 2026-02-22
+
+- **[binary]** Chromium v142.0.7444.175 with 16 source-level fingerprint patches
+- **[binary]** Fix browser brand string to match Chrome 142 format
+- **[wrapper]** `launch()` and `launch_async()` — drop-in Playwright replacements
+- **[wrapper]** Auto-download binary from GitHub Releases, cached in `~/.cloakbrowser/`
+- **[wrapper]** Linux x64 platform support
+- **[wrapper]** Passes 14/14 bot detection tests
+- **[wrapper]** reCAPTCHA v3: 0.9 (server-verified), Cloudflare Turnstile: pass

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2026 cloakbrowser
+Copyright (c) 2026 CloakHQ
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,26 +1,49 @@
 <p align="center">
-<img src="https://raw.githubusercontent.com/CloakHQ/CloakBrowser/main/images/logo.png" width="500" alt="CloakBrowser">
+<img src="https://i.imgur.com/cqkp6fG.png" width="500" alt="CloakBrowser">
 </p>
 
-# CloakBrowser
+<p align="center">
+<a href="https://pypi.org/project/cloakbrowser/"><img src="https://img.shields.io/pypi/v/cloakbrowser" alt="PyPI"></a>
+<a href="https://www.npmjs.com/package/cloakbrowser"><img src="https://img.shields.io/npm/v/cloakbrowser" alt="npm"></a>
+<a href="LICENSE"><img src="https://img.shields.io/github/license/CloakHQ/CloakBrowser" alt="License"></a>
+<a href="https://github.com/CloakHQ/CloakBrowser"><img src="https://img.shields.io/github/last-commit/CloakHQ/CloakBrowser" alt="Last Commit"></a>
+<br>
+<a href="https://github.com/CloakHQ/CloakBrowser"><img src="https://img.shields.io/github/stars/CloakHQ/CloakBrowser" alt="Stars"></a>
+<a href="https://pepy.tech/projects/cloakbrowser"><img src="https://img.shields.io/pepy/dt/cloakbrowser?label=pypi&logo=pypi&logoColor=white" alt="PyPI Downloads"></a>
+<a href="https://www.npmjs.com/package/cloakbrowser"><img src="https://img.shields.io/npm/dt/cloakbrowser?label=npm&logo=npm&logoColor=white" alt="npm Downloads"></a>
+</p>
 
-[![PyPI](https://img.shields.io/pypi/v/cloakbrowser)](https://pypi.org/project/cloakbrowser/)
-[![Python](https://img.shields.io/pypi/pyversions/cloakbrowser)](https://pypi.org/project/cloakbrowser/)
-[![License](https://img.shields.io/github/license/CloakHQ/CloakBrowser)](LICENSE)
-[![Stars](https://img.shields.io/github/stars/CloakHQ/CloakBrowser)](https://github.com/CloakHQ/CloakBrowser)
-[![Last Commit](https://img.shields.io/github/last-commit/CloakHQ/CloakBrowser)](https://github.com/CloakHQ/CloakBrowser)
+<br>
 
-**Stealth Chromium that passes every bot detection test.**
+<h3 align="center">Stealth Chromium that passes every bot detection test.</h3>
 
-Drop-in Playwright replacement. Same API, same code — just swap the import. Your browser now scores **0.9 on reCAPTCHA v3**, passes **Cloudflare Turnstile**, and clears **14 out of 14** stealth detection tests.
+<table><tr><td>
+Not a patched config. Not a JS injection. A real Chromium binary with fingerprints modified at the C++ source level. Antibot systems score it as a normal browser — because it <em>is</em> a normal browser.
+</td></tr></table>
 
-- 🔒 **16 source-level C++ patches** — not JS injection, not config flags
+<br>
+
+<p align="center">
+<img src="https://i.imgur.com/IvB0It7.gif" width="600" alt="Cloudflare Turnstile — 3 Tests Passing">
+<br><em>Cloudflare Turnstile — 3 live tests passing (headed mode, macOS)</em>
+</p>
+
+<br>
+
+<p align="center">
+Drop-in Playwright/Puppeteer replacement for Python and JavaScript.<br>
+Same API, same code — just swap the import. <strong>3 lines of code, 30 seconds to unblock.</strong>
+</p>
+
+- 🔒 **25 source-level C++ patches** — not JS injection, not config flags
+- 🛡️ **CDP stealth built-in** — uses [Patchright](https://github.com/Kaliiiiiiiiii-Vinyzu/patchright) to reduce Playwright's automation footprint
 - 🎯 **0.9 reCAPTCHA v3 score** — human-level, server-verified
-- ☁️ **Passes Cloudflare Turnstile**, FingerprintJS, BrowserScan — 14/14 tests
-- 🔄 **Drop-in Playwright replacement** — same API, swap one import
-- 📦 **`pip install cloakbrowser`** — binary auto-downloads, zero config
-- 🦊 **Fills the Camoufox vacuum** — Chromium-based, actively maintained
+- ☁️ **Passes Cloudflare Turnstile**, FingerprintJS, BrowserScan — 30/30 tests
+- 🔄 **Drop-in replacement** — works with Playwright (Python & JS) and Puppeteer (JS)
+- 📦 **`pip install cloakbrowser`** or **`npm install cloakbrowser`** — binary auto-downloads, zero config
+- 💸 **Enterprise results, zero cost** — anti-detect browsers charge $49–299/month for the same results. CloakBrowser is free
 
+**Python:**
 ```python
 from cloakbrowser import launch
 
@@ -30,30 +53,89 @@ page.goto("https://protected-site.com")  # no more blocks
 browser.close()
 ```
 
+**JavaScript (Playwright):**
+```javascript
+import { launch } from 'cloakbrowser';
+
+const browser = await launch();
+const page = await browser.newPage();
+await page.goto('https://protected-site.com');
+await browser.close();
+```
+
+Also works with Puppeteer: `import { launch } from 'cloakbrowser/puppeteer'` ([details](#puppeteer))
+
 ## Install
 
+**Python:**
 ```bash
 pip install cloakbrowser
 ```
 
+**JavaScript / Node.js:**
+```bash
+# With Playwright
+npm install cloakbrowser playwright-core
+
+# With Puppeteer
+npm install cloakbrowser puppeteer-core
+```
+
 On first run, the stealth Chromium binary is automatically downloaded (~200MB, cached locally).
 
+**Optional:** Auto-detect timezone/locale from proxy IP:
+```bash
+pip install cloakbrowser[geoip]
+```
+
+**Migrating from Playwright?** One-line change:
+
+```diff
+- from playwright.sync_api import sync_playwright
+- pw = sync_playwright().start()
+- browser = pw.chromium.launch()
++ from cloakbrowser import launch
++ browser = launch()
+
+page = browser.new_page()
+page.goto("https://example.com")
+# ... rest of your code works unchanged
+```
+
+> ⭐ **Star** to show support — **[Watch releases](https://github.com/CloakHQ/CloakBrowser/subscription)** to get notified when new builds drop.
+
+## What's New in v0.3.0
+
+- **Chromium 145** — latest stable, 25 fingerprint patches (up from 16). All platforms
+- **9 new patches** — screen dimensions, device memory, audio, WebGL, and more
+- **SHA-256 checksum verification** — binary downloads are verified for integrity
+- **CDP hardening** — audited and patched known automation detection vectors
+- **Full stealth audit** — every patch reviewed for detection vectors, multiple fixes shipped
+- **Timezone & locale from proxy IP** — `launch(proxy="...", geoip=True)` auto-detects timezone and locale
+
+See the full [CHANGELOG.md](CHANGELOG.md) for details.
+
 ## Why CloakBrowser?
 
 - **Config-level patches break** — `playwright-stealth`, `undetected-chromedriver`, and `puppeteer-extra` inject JavaScript or tweak flags. Every Chrome update breaks them. Antibot systems detect the patches themselves.
 - **CloakBrowser patches Chromium source code** — fingerprints are modified at the C++ level, compiled into the binary. Detection sites see a real browser because it *is* a real browser.
+- **Two layers of stealth** — C++ patches handle fingerprints (GPU, screen, UA, hardware reporting), while the Patchright driver defers Playwright's binding registration and randomizes internal world names. Most stealth tools only do one or the other.
+- **Same behavior everywhere** — works identically local, in Docker, and on VPS. No environment-specific patches or config needed.
+- **Works with AI browser agents** — drop-in stealth binary for [browser-use](https://github.com/browser-use/browser-use), [agent-browser](https://github.com/nichochar/agent-browser), Claude computer use, and OpenAI Operator
 - **One line to switch** — same Playwright API, no new abstractions, no CAPTCHA-solving services.
 
+CloakBrowser doesn't solve CAPTCHAs — it prevents them from appearing. Antibot systems score it as a normal browser because it *is* a normal browser, just with your fingerprints instead of theirs. No CAPTCHA services, no proxy rotation built in — bring your own proxies, use the Playwright API you already know.
+
 ## Test Results
 
-All tests verified against live detection services. Last tested: Feb 2026 (Chromium 142).
+All tests verified against live detection services. Last tested: Mar 2026 (Chromium 145).
 
 | Detection Service | Stock Playwright | CloakBrowser | Notes |
 |---|---|---|---|
 | **reCAPTCHA v3** | 0.1 (bot) | **0.9** (human) | Server-side verified |
 | **Cloudflare Turnstile** (non-interactive) | FAIL | **PASS** | Auto-resolve |
 | **Cloudflare Turnstile** (managed) | FAIL | **PASS** | Single click |
-| **ShieldSquare** (yad2.co.il) | BLOCKED | **PASS** | Production site |
+| **ShieldSquare** | BLOCKED | **PASS** | Production site |
 | **FingerprintJS** bot detection | DETECTED | **PASS** | demo.fingerprint.com |
 | **BrowserScan** bot detection | DETECTED | **NORMAL** (4/4) | browserscan.net |
 | **bot.incolumitas.com** | 13 fails | **1 fail** | WEBDRIVER spec only |
@@ -61,57 +143,48 @@ All tests verified against live detection services. Last tested: Feb 2026 (Chrom
 | `navigator.webdriver` | `true` | **`false`** | Source-level patch |
 | `navigator.plugins.length` | 0 | **5** | Real plugin list |
 | `window.chrome` | `undefined` | **`object`** | Present like real Chrome |
-| UA string | `HeadlessChrome` | **`Chrome/142.0.0.0`** | No headless leak |
+| UA string | `HeadlessChrome` | **`Chrome/145.0.0.0`** | No headless leak |
 | CDP detection | Detected | **Not detected** | `isAutomatedWithCDP: false` |
 | TLS fingerprint | Mismatch | **Identical to Chrome** | ja3n/ja4/akamai match |
-
-**14/14 tests passed.**
+| | | **30/30 passed** | |
 
 ### Proof
 
 <p align="center">
-<img src="https://raw.githubusercontent.com/CloakHQ/CloakBrowser/main/images/recaptcha_v3_score_09.png" width="600" alt="reCAPTCHA v3 — Score 0.9">
+<img src="https://i.imgur.com/hvIQyMv.png" width="600" alt="reCAPTCHA v3 — Score 0.9">
 <br><em>reCAPTCHA v3 score 0.9 — server-side verified (human-level)</em>
 </p>
 
 <p align="center">
-<img src="https://raw.githubusercontent.com/CloakHQ/CloakBrowser/main/images/turnstile_non_interactive.png" width="600" alt="Cloudflare Turnstile — Success">
+<img src="https://i.imgur.com/qMIRfhq.png" width="600" alt="Cloudflare Turnstile — Success">
 <br><em>Cloudflare Turnstile non-interactive challenge — auto-resolved</em>
 </p>
 
 <p align="center">
-<img src="https://raw.githubusercontent.com/CloakHQ/CloakBrowser/main/images/browserscan_normal.png" width="600" alt="BrowserScan — Normal">
+<img src="https://i.imgur.com/PRsw6rT.png" width="600" alt="BrowserScan — Normal">
 <br><em>BrowserScan bot detection — NORMAL (4/4 checks passed)</em>
 </p>
 
 <p align="center">
-<img src="https://raw.githubusercontent.com/CloakHQ/CloakBrowser/main/images/fingerprintjs_pass.png" width="600" alt="FingerprintJS — Passed">
+<img src="https://i.imgur.com/9n2C7tu.png" width="600" alt="FingerprintJS — Passed">
 <br><em>FingerprintJS web-scraping demo — data served, not blocked</em>
 </p>
 
 ## How It Works
 
-CloakBrowser is a thin Python wrapper around a custom-built Chromium binary:
+CloakBrowser is a thin wrapper (Python + JavaScript) around a custom-built Chromium binary:
 
-1. **You install** → `pip install cloakbrowser`
-2. **First launch** → binary auto-downloads for your platform (Linux x64 / macOS arm64)
-3. **Every launch** → Playwright starts with our binary + stealth args
-4. **You write code** → standard Playwright API, nothing new to learn
+1. **You install** → `pip install cloakbrowser` or `npm install cloakbrowser`
+2. **First launch** → binary auto-downloads for your platform (Chromium 145)
+3. **Every launch** → Playwright or Puppeteer starts with our binary + stealth args
+4. **You write code** → standard Playwright/Puppeteer API, nothing new to learn
 
-The binary includes 16 source-level patches that modify:
-- Canvas fingerprint generation
-- WebGL renderer output
-- Audio processing fingerprint
-- Font enumeration results
-- Hardware concurrency reporting
-- Client rect measurements
-- GPU vendor/renderer strings
-- WebDriver flag
-- Headless detection signals
-- And more...
+The binary includes 25 source-level patches covering canvas, WebGL, audio, fonts, GPU, screen properties, hardware reporting, and automation signal removal.
 
 These are compiled into the Chromium binary — not injected via JavaScript, not set via flags.
 
+Binary downloads are verified with SHA-256 checksums to ensure integrity.
+
 ## API
 
 ### `launch()`
@@ -131,6 +204,15 @@ browser = launch(proxy="http://user:pass@proxy:8080")
 # With extra Chrome args
 browser = launch(args=["--disable-gpu", "--window-size=1920,1080"])
 
+# With timezone and locale (sets both binary flags and Playwright context)
+browser = launch(timezone="America/New_York", locale="en-US")
+
+# Auto-detect timezone/locale from proxy IP (requires: pip install cloakbrowser[geoip])
+browser = launch(proxy="http://proxy:8080", geoip=True)
+
+# Explicit timezone/locale always win over auto-detection
+browser = launch(proxy="http://proxy:8080", geoip=True, timezone="Europe/London")
+
 # Without default stealth args (bring your own fingerprint flags)
 browser = launch(stealth_args=False, args=["--fingerprint=12345"])
 ```
@@ -176,7 +258,7 @@ from cloakbrowser import binary_info, clear_cache, ensure_binary
 
 # Check binary installation status
 print(binary_info())
-# {'version': '142.0.7444.175', 'platform': 'linux-x64', 'installed': True, ...}
+# {'version': '145.0.7632.109', 'platform': 'linux-x64', 'installed': True, ...}
 
 # Force re-download
 clear_cache()
@@ -185,28 +267,158 @@ clear_cache()
 ensure_binary()
 ```
 
+## JavaScript / Node.js API
+
+CloakBrowser ships a TypeScript package with full type definitions. Choose Playwright or Puppeteer — same stealth binary underneath.
+
+### Playwright (default)
+
+```javascript
+import { launch, launchContext } from 'cloakbrowser';
+
+// Basic
+const browser = await launch();
+
+// With options
+const browser = await launch({
+  headless: false,
+  proxy: 'http://user:pass@proxy:8080',
+  args: ['--window-size=1920,1080'],
+  timezone: 'America/New_York',
+  locale: 'en-US',
+});
+
+// Convenience: browser + context in one call
+const context = await launchContext({
+  userAgent: 'Custom UA',
+  viewport: { width: 1920, height: 1080 },
+  locale: 'en-US',
+  timezoneId: 'America/New_York',
+});
+const page = await context.newPage();
+```
+
+> **Note:** Each example above is standalone — not meant to run as one block.
+
+All Python options work in JS: `stealthArgs: false` to disable defaults, `geoip: true` to auto-detect timezone/locale from proxy IP.
+
+### Puppeteer
+
+> **Note:** The Playwright wrapper is recommended for sites with reCAPTCHA Enterprise. Puppeteer's CDP protocol leaks automation signals that reCAPTCHA Enterprise can detect, causing intermittent 403 errors. This is a known Puppeteer limitation, not specific to CloakBrowser. Use Playwright for best results.
+
+```javascript
+import { launch } from 'cloakbrowser/puppeteer';
+
+const browser = await launch({ headless: true });
+const page = await browser.newPage();
+await page.goto('https://example.com');
+await browser.close();
+```
+
+### Utility Functions (JS)
+
+```javascript
+import { ensureBinary, clearCache, binaryInfo } from 'cloakbrowser';
+
+// Pre-download binary (e.g., during Docker build)
+await ensureBinary();
+
+// Check installation status
+console.log(binaryInfo());
+
+// Force re-download
+clearCache();
+```
+
 ## Configuration
 
 | Env Variable | Default | Description |
 |---|---|---|
 | `CLOAKBROWSER_BINARY_PATH` | — | Skip download, use a local Chromium binary |
 | `CLOAKBROWSER_CACHE_DIR` | `~/.cloakbrowser` | Binary cache directory |
-| `CLOAKBROWSER_DOWNLOAD_URL` | GitHub Releases | Custom download URL for binary |
+| `CLOAKBROWSER_DOWNLOAD_URL` | `cloakbrowser.dev` | Custom download URL for binary |
+| `CLOAKBROWSER_AUTO_UPDATE` | `true` | Set to `false` to disable background update checks |
+| `CLOAKBROWSER_SKIP_CHECKSUM` | `false` | Set to `true` to skip SHA-256 verification after download |
 
-## Use With Existing Playwright Code
+## Fingerprint Management
 
-If you have existing Playwright scripts, migration is one line:
+The binary is **stealthy by default** — no flags needed. It auto-generates a random fingerprint seed at startup and spoofs all detectable values (GPU, hardware specs, screen dimensions, canvas, WebGL, audio, fonts). Every launch produces a fresh, coherent identity.
 
-```diff
-- from playwright.sync_api import sync_playwright
-- pw = sync_playwright().start()
-- browser = pw.chromium.launch()
-+ from cloakbrowser import launch
-+ browser = launch()
+**How fingerprinting works:**
 
-page = browser.new_page()
-page.goto("https://example.com")
-# ... rest of your code works unchanged
+| Scenario | What happens |
+|----------|-------------|
+| **No flags** | Random seed auto-generated at startup. GPU, screen, hardware specs, and all noise patches are spoofed automatically. Fresh identity each launch. |
+| **`--fingerprint=seed`** | Deterministic identity from the seed. Same seed = same fingerprint across launches. Use this for session persistence (returning visitor). |
+| **`--fingerprint=seed` + explicit flags** | Explicit flags override individual auto-generated values. The seed fills in everything else. |
+
+The binary detects its platform at compile time — a macOS binary reports Apple GPU and macOS screen (1440x900), a Linux binary reports NVIDIA GPU and 1080p screen. Override with `--fingerprint-platform` for cross-platform spoofing (e.g. Linux binary appearing as Windows).
+
+> **Tip: Use a fixed seed when revisiting the same site.** A random seed makes every session look like a different device — which can be suspicious when hitting the same site repeatedly from the same IP. For reCAPTCHA v3 Enterprise and similar scoring systems, a fixed seed produces a consistent fingerprint across sessions, making you look like a returning visitor:
+> ```python
+> browser = launch(args=["--fingerprint=12345"])
+> ```
+> ```javascript
+> const browser = await launch({ args: ['--fingerprint=12345'] });
+> ```
+
+### Default Fingerprint
+
+Every `launch()` call sets these automatically. Defaults are **platform-aware** — macOS runs as a native Mac browser, Linux and Windows use the Windows fingerprint profile:
+
+| Flag | Linux/Windows Default | macOS Default | Controls |
+|------|--------------|---------------|----------|
+| `--fingerprint` | Random (10000–99999) | Random (10000–99999) | Master seed for canvas, WebGL, audio, fonts, client rects |
+| `--fingerprint-platform` | `windows` | `macos` | `navigator.platform`, User-Agent OS, GPU pool selection |
+| `--fingerprint-hardware-concurrency` | `8` | *(not set — uses real value)* | `navigator.hardwareConcurrency` |
+| `--fingerprint-gpu-vendor` | `NVIDIA Corporation` | `Google Inc. (Apple)` | WebGL `UNMASKED_VENDOR_WEBGL` |
+| `--fingerprint-gpu-renderer` | `NVIDIA GeForce RTX 3070` | `ANGLE (Apple, ANGLE Metal Renderer: Apple M3, Unspecified Version)` | WebGL `UNMASKED_RENDERER_WEBGL` |
+| `--fingerprint-device-memory` | `8` | *(not set)* | `navigator.deviceMemory` |
+| `--fingerprint-screen-width` | `1920` | *(not set)* | Screen width reporting |
+| `--fingerprint-screen-height` | `1080` | *(not set)* | Screen height reporting |
+| `--window-size` | `1920,1080` | *(not set)* | Browser window dimensions |
+
+> **Using the binary directly?** It works out of the box with zero flags — the binary auto-spoofs everything. Pass `--fingerprint=seed` for a persistent identity, or use explicit flags like `--fingerprint-gpu-renderer` to override any auto-generated value.
+
+> **Production tip:** For better stealth at scale, pass your own GPU, screen, and hardware values instead of relying on defaults. Custom parameters make your sessions harder to cluster by anti-bot systems that look for uniform fingerprint profiles.
+
+### Additional Flags
+
+Supported by the binary but **not set by default** — pass via `args` to customize:
+
+| Flag | Controls |
+|------|----------|
+| `--fingerprint-brand` | Browser brand: `Chrome`, `Edge`, `Opera`, `Vivaldi` |
+| `--fingerprint-brand-version` | Brand version (UA + Client Hints) |
+| `--fingerprint-platform-version` | Client Hints platform version |
+| `--fingerprint-location` | Geolocation coordinates |
+| `--fingerprint-timezone` | Timezone (e.g. `America/New_York`) |
+| `--fingerprint-taskbar-height` | Override taskbar height (binary defaults: Win=48, Mac=95, Linux=0) |
+| `--fingerprint-fonts-dir` | Path to cross-platform font directory |
+| `--enable-blink-features=FakeShadowRoot` | Access closed shadow DOM elements |
+
+> **Note:** All stealth tests were verified with the default fingerprint config above. Changing these flags may affect detection results — test your configuration before using in production.
+
+### Examples
+
+```python
+# Pin a seed for a persistent identity
+browser = launch(args=["--fingerprint=42069"])
+
+# Full control — disable defaults, set everything yourself
+browser = launch(stealth_args=False, args=[
+    "--fingerprint=42069",
+    "--fingerprint-platform=windows",
+    "--fingerprint-hardware-concurrency=8",
+    "--fingerprint-gpu-vendor=NVIDIA Corporation",
+    "--fingerprint-gpu-renderer=NVIDIA GeForce RTX 3070",
+])
+
+# Override GPU to look like a different machine
+browser = launch(args=[
+    "--fingerprint-gpu-vendor=Intel Inc.",
+    "--fingerprint-gpu-renderer=Intel Iris OpenGL Engine",
+])
 ```
 
 ## Comparison
@@ -217,38 +429,46 @@ page.goto("https://example.com")
 | Cloudflare Turnstile | Fail | Sometimes | Sometimes | Pass | **Pass** |
 | Patch level | None | JS injection | Config patches | C++ (Firefox) | **C++ (Chromium)** |
 | Survives Chrome updates | N/A | Breaks often | Breaks often | Yes | **Yes** |
-| Maintained | Yes | Stale | Stale | Dead (2025) | **Active** |
+| Maintained | Yes | Stale | Stale | Unstable (2026 beta) | **Active** |
 | Browser engine | Chromium | Chromium | Chrome | Firefox | **Chromium** |
 | Playwright API | Native | Native | No (Selenium) | No | **Native** |
 
 ## Platforms
 
-| Platform | Status |
-|---|---|
-| Linux x86_64 | Supported |
-| macOS arm64 (Apple Silicon) | Coming soon |
-| macOS x86_64 (Intel) | Coming soon |
-| Windows | Planned |
+| Platform | Chromium | Patches | Status |
+|---|---|---|---|
+| Linux x86_64 | 145 | 25 | ✅ Latest |
+| macOS arm64 (Apple Silicon) | 145 | 25 | ✅ Latest |
+| macOS x86_64 (Intel) | 145 | 25 | ✅ Latest |
+| Windows x86_64 | 145 | 25 | ✅ Latest |
+
+The wrapper auto-downloads the correct binary for your platform.
+
+**macOS first launch:** The binary is ad-hoc signed. On first run, macOS Gatekeeper will block it. Right-click the app → **Open** → click **Open** in the dialog. This is only needed once.
 
 ## Examples
 
-See the [`examples/`](examples/) directory:
+**Python** — see [`examples/`](examples/):
 - [`basic.py`](examples/basic.py) — Launch and load a page
 - [`recaptcha_score.py`](examples/recaptcha_score.py) — Check your reCAPTCHA v3 score
 - [`stealth_test.py`](examples/stealth_test.py) — Run against all detection services
+- [`fingerprint_scan_test.py`](examples/fingerprint_scan_test.py) — Test against fingerprint-scan.com and CreepJS
+
+**JavaScript** — see [`js/examples/`](js/examples/):
+- [`basic-playwright.ts`](js/examples/basic-playwright.ts) — Playwright launch and load
+- [`basic-puppeteer.ts`](js/examples/basic-puppeteer.ts) — Puppeteer launch and load
+- [`stealth-test.ts`](js/examples/stealth-test.ts) — Full 6-site detection test suite
 
 ## Roadmap
 
 | Feature | Status |
 |---------|--------|
-| Linux x64 binary | ✅ Released |
-| macOS arm64 (Apple Silicon) | 🔜 In progress |
-| Chromium 145 build | 🔜 In progress |
-| Fingerprint rotation per session | 📋 Planned |
+| Linux x64 — Chromium 145 (25 patches) | ✅ Released |
+| macOS arm64/x64 — Chromium 145 (25 patches) | ✅ Released |
+| Windows x64 — Chromium 145 (25 patches) | ✅ Released |
+| JavaScript/Puppeteer + Playwright support | ✅ Released |
+| Fingerprint rotation per session | ✅ Released |
 | Built-in proxy rotation | 📋 Planned |
-| Windows support | 📋 Planned |
-
-> ⭐ **Star this repo** to get notified when Chromium 145 and macOS builds drop.
 
 ## Docker
 
@@ -272,29 +492,131 @@ COPY your_script.py /app/
 CMD ["python", "your_script.py"]
 ```
 
+**With a proxy** (the most common production setup):
+
+```bash
+docker run --rm cloakbrowser python -c "
+from cloakbrowser import launch
+browser = launch(proxy='http://user:pass@proxy:8080')
+page = browser.new_page()
+page.goto('https://example.com')
+print(page.title())
+browser.close()
+"
+```
+
+CloakBrowser works identically local, in Docker, and on VPS. No environment-specific config needed.
+
 **Note:** If you run CloakBrowser inside a web server with uvloop (e.g., `uvicorn[standard]`), use `--loop asyncio` to avoid subprocess pipe hangs.
 
+## Headed Mode (for aggressive bot detection)
+
+Some sites using advanced bot detection (e.g., DataDome, Cloudflare Turnstile) can detect headless mode even with our C++ patches. For these sites, run in **headed mode** with a virtual display:
+
+```bash
+# Install Xvfb (virtual framebuffer)
+sudo apt install xvfb
+
+# Start virtual display
+Xvfb :99 -screen 0 1920x1080x24 &
+export DISPLAY=:99
+```
+
+```python
+from cloakbrowser import launch
+
+# Headed mode + residential proxy for maximum stealth
+browser = launch(headless=False, proxy="http://your-residential-proxy:port")
+page = browser.new_page()
+page.goto("https://heavily-protected-site.com")  # passes DataDome, etc.
+browser.close()
+```
+
+This runs a real headed browser rendered on a virtual display — no physical monitor needed. Combined with a residential proxy, this passes even the most aggressive detection services.
+
+> **Tip:** Datacenter IPs are often flagged by IP reputation databases regardless of browser fingerprint. For sites with strict bot detection, a residential proxy makes the difference.
+
 ## Troubleshooting
 
+**Reddit or similar sites show CAPTCHA / "Prove your humanity"**
+
+Some sites (notably Reddit homepage) use HTTP/2 fingerprinting that detects Playwright's connection layer. Pass `--disable-http2` to fall back to HTTP/1.1:
+
+```python
+browser = launch(args=["--disable-http2"])
+```
+
+```javascript
+const browser = await launch({ args: ['--disable-http2'] });
+```
+
+Only use this flag for sites that require it — most sites work fine with HTTP/2.
+
+**Something not working? Make sure you're on the latest wrapper**
+Older versions may use outdated stealth args or download an older binary:
+```bash
+pip install -U cloakbrowser    # Python
+npm install cloakbrowser@latest # JavaScript
+```
+
 **Binary download fails / timeout**
 Set a custom download URL or use a local binary:
 ```bash
 export CLOAKBROWSER_BINARY_PATH=/path/to/your/chrome
 ```
 
+**macOS: "App is damaged" or Gatekeeper blocks launch**
+The binary is ad-hoc signed. macOS quarantines downloaded files. Run once to clear it:
+```bash
+xattr -cr ~/.cloakbrowser/chromium-*/Chromium.app
+```
+
 **"playwright install" vs CloakBrowser binary**
 You do NOT need `playwright install chromium`. CloakBrowser downloads its own binary. You only need Playwright's system deps:
 ```bash
-playwright install-deps chromium
+patchright install-deps chromium
 ```
 
+**reCAPTCHA v3 scores are low (0.1–0.3)**
+
+Avoid `page.wait_for_timeout()` — it sends CDP protocol commands that reCAPTCHA detects. Use native sleep instead:
+
+```python
+# Bad — sends CDP commands, reCAPTCHA detects this
+page.wait_for_timeout(3000)
+
+# Good — invisible to the browser
+import time
+time.sleep(3)
+```
+
+```javascript
+// Bad — sends CDP commands
+await page.waitForTimeout(3000);
+
+// Good — invisible to the browser
+await new Promise(r => setTimeout(r, 3000));
+```
+
+Other tips for maximizing reCAPTCHA scores:
+- **Use Playwright, not Puppeteer** — Puppeteer sends more CDP protocol traffic that reCAPTCHA detects ([details](#puppeteer))
+- **Use residential proxies** — datacenter IPs are flagged by IP reputation, not browser fingerprint
+- **Spend 15+ seconds on the page** before triggering reCAPTCHA — short visits score lower
+- **Space out requests** — back-to-back `grecaptcha.execute()` calls from the same session get penalized. Wait 30+ seconds between pages with reCAPTCHA
+- **Use a fixed fingerprint seed** for consistent device identity across sessions (see [Fingerprint Management](#fingerprint-management))
+- **Use `page.type()` instead of `page.fill()`** for form filling — `fill()` sets values directly without keyboard events, which reCAPTCHA's behavioral analysis flags. `type()` with a delay simulates real keystrokes:
+  ```python
+  page.type("#email", "user@example.com", delay=50)
+  ```
+- **Minimize `page.evaluate()` calls** before the reCAPTCHA check fires — each one sends CDP traffic
+
 ## FAQ
 
 **Q: Is this legal?**
 A: CloakBrowser is a browser. Using it is legal. What you do with it is your responsibility, just like with Chrome, Firefox, or any browser. We do not endorse violating website terms of service.
 
 **Q: How is this different from Camoufox?**
-A: Camoufox patched Firefox. We patch Chromium. Chromium means native Playwright support, larger ecosystem, and TLS fingerprints that match real Chrome. Also, Camoufox is no longer maintained (since March 2025).
+A: Camoufox patches Firefox. We patch Chromium. Chromium means native Playwright support, larger ecosystem, and TLS fingerprints that match real Chrome. Camoufox returned in early 2026 but is in unstable beta — CloakBrowser is production-ready.
 
 **Q: Will detection sites eventually catch this?**
 A: Possibly. Bot detection is an arms race. Source-level patches are harder to detect than config-level patches, but not impossible. We actively monitor and update when detection evolves.
@@ -302,13 +624,20 @@ A: Possibly. Bot detection is an arms race. Source-level patches are harder to d
 **Q: Can I use my own proxy?**
 A: Yes. Pass `proxy="http://user:pass@host:port"` to `launch()`.
 
-**Q: Can I use this with Docker?**
-A: Yes. A ready-to-use Dockerfile is included — see the [Docker](#docker) section above.
+## Links
+
+- 📋 **Changelog** — [CHANGELOG.md](CHANGELOG.md)
+- 🌐 **Website** — [cloakbrowser.dev](https://cloakbrowser.dev)
+- 🐛 **Bug reports & feature requests** — [GitHub Issues](https://github.com/CloakHQ/CloakBrowser/issues)
+- 📦 **PyPI** — [pypi.org/project/cloakbrowser](https://pypi.org/project/cloakbrowser/)
+- 📦 **npm** — [npmjs.com/package/cloakbrowser](https://www.npmjs.com/package/cloakbrowser)
+- 📧 **Contact** — cloakhq@pm.me
 
 ## License
 
-MIT — see [LICENSE](LICENSE).
+- **Wrapper code** (this repository) — MIT. See [LICENSE](https://github.com/CloakHQ/CloakBrowser/blob/main/LICENSE).
+- **CloakBrowser binary** (compiled Chromium) — free to use, no redistribution. See [BINARY-LICENSE.md](https://github.com/CloakHQ/CloakBrowser/blob/main/BINARY-LICENSE.md).
 
 ## Contributing
 
-Issues and PRs welcome. Contact: cloakhq@pm.me
+Issues and PRs welcome. If something isn't working, [open an issue](https://github.com/CloakHQ/CloakBrowser/issues) — we respond fast.

cloakbrowser/__init__.py

@@ -12,8 +12,8 @@ Usage:
 """
 
 from .browser import launch, launch_async, launch_context
-from .config import CHROMIUM_VERSION, DEFAULT_STEALTH_ARGS
-from .download import binary_info, clear_cache, ensure_binary
+from .config import CHROMIUM_VERSION, get_default_stealth_args
+from .download import binary_info, check_for_update, clear_cache, ensure_binary
 from ._version import __version__
 
 __all__ = [
@@ -23,7 +23,8 @@ __all__ = [
     "ensure_binary",
     "clear_cache",
     "binary_info",
+    "check_for_update",
     "CHROMIUM_VERSION",
-    "DEFAULT_STEALTH_ARGS",
+    "get_default_stealth_args",
     "__version__",
 ]

cloakbrowser/_version.py

@@ -1 +1 @@
-__version__ = "0.1.3"
+__version__ = "0.3.3"

cloakbrowser/browser.py

@@ -15,9 +15,10 @@ Usage:
 from __future__ import annotations
 
 import logging
-from typing import Any
+from typing import Any, Literal
+from urllib.parse import unquote, urlparse, urlunparse
 
-from .config import DEFAULT_STEALTH_ARGS
+from .config import DEFAULT_VIEWPORT, get_default_stealth_args
 from .download import ensure_binary
 
 logger = logging.getLogger("cloakbrowser")
@@ -28,6 +29,9 @@ def launch(
     proxy: str | None = None,
     args: list[str] | None = None,
     stealth_args: bool = True,
+    timezone: str | None = None,
+    locale: str | None = None,
+    geoip: bool = False,
     **kwargs: Any,
 ) -> Any:
     """Launch stealth Chromium browser. Returns a Playwright Browser object.
@@ -38,6 +42,12 @@ def launch(
         args: Additional Chromium CLI arguments to pass.
         stealth_args: Include default stealth fingerprint args (default True).
             Set to False if you want to pass your own --fingerprint flags.
+        timezone: IANA timezone (e.g. 'America/New_York'). Sets --fingerprint-timezone binary flag.
+        locale: BCP 47 locale (e.g. 'en-US'). Sets --lang binary flag.
+        geoip: Auto-detect timezone/locale from proxy IP (default False).
+            Requires ``pip install cloakbrowser[geoip]``. Downloads ~70 MB
+            GeoLite2-City database on first use.  Explicit timezone/locale
+            always override geoip results.
         **kwargs: Passed directly to playwright.chromium.launch().
 
     Returns:
@@ -51,10 +61,11 @@ def launch(
         >>> print(page.title())
         >>> browser.close()
     """
-    from playwright.sync_api import sync_playwright
+    from patchright.sync_api import sync_playwright
 
     binary_path = ensure_binary()
-    chrome_args = _build_args(stealth_args, args)
+    timezone, locale = _maybe_resolve_geoip(geoip, proxy, timezone, locale)
+    chrome_args = _build_args(stealth_args, args, timezone=timezone, locale=locale)
 
     logger.debug("Launching stealth Chromium (headless=%s, args=%d)", headless, len(chrome_args))
 
@@ -63,6 +74,7 @@ def launch(
         executable_path=binary_path,
         headless=headless,
         args=chrome_args,
+        ignore_default_args=["--enable-automation"],
         **_build_proxy_kwargs(proxy),
         **kwargs,
     )
@@ -84,6 +96,9 @@ async def launch_async(
     proxy: str | None = None,
     args: list[str] | None = None,
     stealth_args: bool = True,
+    timezone: str | None = None,
+    locale: str | None = None,
+    geoip: bool = False,
     **kwargs: Any,
 ) -> Any:
     """Async version of launch(). Returns a Playwright Browser object.
@@ -93,6 +108,9 @@ async def launch_async(
         proxy: Proxy server URL (e.g. 'http://proxy:8080' or 'socks5://proxy:1080').
         args: Additional Chromium CLI arguments to pass.
         stealth_args: Include default stealth fingerprint args (default True).
+        timezone: IANA timezone (e.g. 'America/New_York'). Sets --fingerprint-timezone binary flag.
+        locale: BCP 47 locale (e.g. 'en-US'). Sets --lang binary flag.
+        geoip: Auto-detect timezone/locale from proxy IP (default False).
         **kwargs: Passed directly to playwright.chromium.launch().
 
     Returns:
@@ -111,10 +129,11 @@ async def launch_async(
         >>>
         >>> asyncio.run(main())
     """
-    from playwright.async_api import async_playwright
+    from patchright.async_api import async_playwright
 
     binary_path = ensure_binary()
-    chrome_args = _build_args(stealth_args, args)
+    timezone, locale = _maybe_resolve_geoip(geoip, proxy, timezone, locale)
+    chrome_args = _build_args(stealth_args, args, timezone=timezone, locale=locale)
 
     logger.debug("Launching stealth Chromium async (headless=%s, args=%d)", headless, len(chrome_args))
 
@@ -123,6 +142,7 @@ async def launch_async(
         executable_path=binary_path,
         headless=headless,
         args=chrome_args,
+        ignore_default_args=["--enable-automation"],
         **_build_proxy_kwargs(proxy),
         **kwargs,
     )
@@ -148,6 +168,8 @@ def launch_context(
     viewport: dict | None = None,
     locale: str | None = None,
     timezone_id: str | None = None,
+    color_scheme: Literal["light", "dark", "no-preference"] | None = None,
+    geoip: bool = False,
     **kwargs: Any,
 ) -> Any:
     """Launch stealth browser and return a BrowserContext with common options pre-set.
@@ -164,22 +186,31 @@ def launch_context(
         viewport: Viewport size dict, e.g. {"width": 1920, "height": 1080}.
         locale: Browser locale, e.g. "en-US".
         timezone_id: Timezone, e.g. "America/New_York".
+        color_scheme: Color scheme preference — 'light', 'dark', or 'no-preference'.
+            Default: None (uses Chromium default, which is 'light').
+            Note: 'no-preference' doesn't work in Patchright (falls back to 'light').
+        geoip: Auto-detect timezone/locale from proxy IP (default False).
         **kwargs: Passed to browser.new_context().
 
     Returns:
         Playwright BrowserContext object.
     """
-    browser = launch(headless=headless, proxy=proxy, args=args, stealth_args=stealth_args)
+    # Resolve geoip BEFORE launch() to avoid double-resolution and ensure
+    # resolved values flow to both binary flags AND context params
+    timezone_id, locale = _maybe_resolve_geoip(geoip, proxy, timezone_id, locale)
+    browser = launch(headless=headless, proxy=proxy, args=args, stealth_args=stealth_args,
+                     timezone=timezone_id, locale=locale)
 
     context_kwargs: dict[str, Any] = {}
     if user_agent:
         context_kwargs["user_agent"] = user_agent
-    if viewport:
-        context_kwargs["viewport"] = viewport
+    context_kwargs["viewport"] = viewport or DEFAULT_VIEWPORT
     if locale:
         context_kwargs["locale"] = locale
     if timezone_id:
         context_kwargs["timezone_id"] = timezone_id
+    if color_scheme:
+        context_kwargs["color_scheme"] = color_scheme
     context_kwargs.update(kwargs)
 
     try:
@@ -205,13 +236,69 @@ def launch_context(
 # ---------------------------------------------------------------------------
 
 
-def _build_args(stealth_args: bool, extra_args: list[str] | None) -> list[str]:
-    """Combine stealth args with user-provided args."""
+def _maybe_resolve_geoip(
+    geoip: bool,
+    proxy: str | None,
+    timezone: str | None,
+    locale: str | None,
+) -> tuple[str | None, str | None]:
+    """Auto-fill timezone/locale from proxy IP when geoip is enabled."""
+    if not geoip or not proxy or (timezone is not None and locale is not None):
+        return timezone, locale
+
+    from .geoip import resolve_proxy_geo
+
+    geo_tz, geo_locale = resolve_proxy_geo(proxy)
+    if timezone is None:
+        timezone = geo_tz
+    if locale is None:
+        locale = geo_locale
+    return timezone, locale
+
+
+def _build_args(
+    stealth_args: bool,
+    extra_args: list[str] | None,
+    timezone: str | None = None,
+    locale: str | None = None,
+) -> list[str]:
+    """Combine stealth args with user-provided args and locale flags."""
     result = []
     if stealth_args:
-        result.extend(DEFAULT_STEALTH_ARGS)
+        result.extend(get_default_stealth_args())
     if extra_args:
         result.extend(extra_args)
+    # Timezone/locale flags are independent of stealth_args — always inject when set
+    if timezone:
+        result.append(f"--fingerprint-timezone={timezone}")
+    if locale:
+        result.append(f"--lang={locale}")
+    return result
+
+
+def _parse_proxy_url(proxy: str) -> dict[str, Any]:
+    """Parse proxy URL, extracting credentials into separate Playwright fields.
+
+    Handles: http://user:pass@host:port -> {server: "http://host:port", username: "user", password: "pass"}
+    Also handles: no credentials, URL-encoded special chars, socks5://, missing port.
+    """
+    parsed = urlparse(proxy)
+
+    if not parsed.username:
+        return {"server": proxy}
+
+    # Rebuild server URL without credentials
+    netloc = parsed.hostname or ""
+    if parsed.port:
+        netloc += f":{parsed.port}"
+
+    server = urlunparse((parsed.scheme, netloc, parsed.path, "", "", ""))
+
+    result: dict[str, Any] = {"server": server}
+    result["username"] = unquote(parsed.username)
+    if parsed.password:
+        result["password"] = unquote(parsed.password)
+
     return result
 
 
@@ -219,4 +306,4 @@ def _build_proxy_kwargs(proxy: str | None) -> dict[str, Any]:
     """Build proxy kwargs for Playwright launch."""
     if proxy is None:
         return {}
-    return {"proxy": {"server": proxy}}
+    return {"proxy": _parse_proxy_url(proxy)}

cloakbrowser/config.py

@@ -4,29 +4,72 @@ from __future__ import annotations
 
 import os
 import platform
+import random
 from pathlib import Path
 
 from ._version import __version__
 
 # ---------------------------------------------------------------------------
-# Chromium version shipped with this release
+# Chromium version shipped with this release.
+# Different platforms may ship different versions during transition periods.
+# CHROMIUM_VERSION is the latest across all platforms (for display/reference).
+# Use get_chromium_version() for the current platform's actual version.
 # ---------------------------------------------------------------------------
-CHROMIUM_VERSION = "142.0.7444.175"
+CHROMIUM_VERSION = "145.0.7632.109"
+
+PLATFORM_CHROMIUM_VERSIONS: dict[str, str] = {
+    "linux-x64": "145.0.7632.109",
+    "darwin-arm64": "145.0.7632.109",
+    "darwin-x64": "145.0.7632.109",
+    "windows-x64": "145.0.7632.109",
+}
 
 # ---------------------------------------------------------------------------
 # Default stealth arguments passed to the patched Chromium binary.
 # These activate source-level fingerprint patches compiled into the binary.
 # ---------------------------------------------------------------------------
-DEFAULT_STEALTH_ARGS: list[str] = [
-    "--no-sandbox",
-    "--disable-blink-features=AutomationControlled",
-    # Fingerprint overrides (activate compiled C++ patches)
-    "--fingerprint=98765",
-    "--fingerprint-platform=windows",
-    "--fingerprint-hardware-concurrency=8",
-    "--fingerprint-gpu-vendor=NVIDIA Corporation",
-    "--fingerprint-gpu-renderer=NVIDIA GeForce RTX 4070",
-]
+def get_default_stealth_args() -> list[str]:
+    """Build stealth args with a random fingerprint seed per launch.
+
+    On macOS, skips platform/GPU spoofing — runs as a native Mac browser.
+    Spoofing Windows on Mac creates detectable mismatches (fonts, GPU, etc.).
+    """
+    seed = random.randint(10000, 99999)
+    system = platform.system()
+
+    base = [
+        "--no-sandbox",
+        "--disable-blink-features=AutomationControlled",
+        f"--fingerprint={seed}",
+    ]
+
+    if system == "Darwin":
+        # Tell the fingerprint patches we're on macOS so GPU/UA match natively
+        return base + [
+            "--fingerprint-platform=macos",
+            "--fingerprint-gpu-vendor=Google Inc. (Apple)",
+            "--fingerprint-gpu-renderer=ANGLE (Apple, ANGLE Metal Renderer: Apple M3, Unspecified Version)",
+        ]
+
+    # Linux/Windows: Windows fingerprint profile
+    return base + [
+        "--fingerprint-platform=windows",
+        "--fingerprint-hardware-concurrency=8",
+        "--fingerprint-device-memory=8",
+        "--fingerprint-gpu-vendor=NVIDIA Corporation",
+        "--fingerprint-gpu-renderer=NVIDIA GeForce RTX 3070",
+        "--fingerprint-screen-width=1920",
+        "--fingerprint-screen-height=1080",
+        "--window-size=1920,1080",
+    ]
+
+
+# ---------------------------------------------------------------------------
+# Default viewport — realistic maximized Chrome on 1080p Windows
+# screen=1920x1080, availHeight=1032 (minus 48px taskbar, binary default),
+# innerHeight=947 (minus ~85px Chrome UI: tabs + address bar + bookmarks)
+# ---------------------------------------------------------------------------
+DEFAULT_VIEWPORT = {"width": 1920, "height": 947}
 
 # ---------------------------------------------------------------------------
 # Platform detection
@@ -36,8 +79,19 @@ SUPPORTED_PLATFORMS: dict[tuple[str, str], str] = {
     ("Linux", "aarch64"): "linux-arm64",
     ("Darwin", "arm64"): "darwin-arm64",
     ("Darwin", "x86_64"): "darwin-x64",
+    ("Windows", "AMD64"): "windows-x64",
+    ("Windows", "x86_64"): "windows-x64",
 }
 
+# Platforms with pre-built binaries available for download (derived from version map).
+AVAILABLE_PLATFORMS: set[str] = set(PLATFORM_CHROMIUM_VERSIONS.keys())
+
+
+def get_chromium_version() -> str:
+    """Return the Chromium version for the current platform."""
+    tag = get_platform_tag()
+    return PLATFORM_CHROMIUM_VERSIONS.get(tag, CHROMIUM_VERSION)
+
 
 def get_platform_tag() -> str:
     """Return the platform tag for binary download (e.g. 'linux-x64', 'darwin-arm64')."""
@@ -67,37 +121,104 @@ def get_cache_dir() -> Path:
     return Path.home() / ".cloakbrowser"
 
 
-def get_binary_dir() -> Path:
-    """Return the directory for the current Chromium version binary."""
-    return get_cache_dir() / f"chromium-{CHROMIUM_VERSION}"
+def get_binary_dir(version: str | None = None) -> Path:
+    """Return the directory for a Chromium version binary."""
+    v = version or get_chromium_version()
+    return get_cache_dir() / f"chromium-{v}"
 
 
-def get_binary_path() -> Path:
+def get_binary_path(version: str | None = None) -> Path:
     """Return the expected path to the chrome executable."""
-    platform_tag = get_platform_tag()
-    binary_dir = get_binary_dir()
+    binary_dir = get_binary_dir(version)
 
     if platform.system() == "Darwin":
         # macOS: Chromium.app bundle
         return binary_dir / "Chromium.app" / "Contents" / "MacOS" / "Chromium"
+    elif platform.system() == "Windows":
+        return binary_dir / "chrome.exe"
     else:
         # Linux: flat binary
         return binary_dir / "chrome"
 
 
+def check_platform_available() -> None:
+    """Raise a clear error if no pre-built binary exists for this platform.
+
+    Skipped when CLOAKBROWSER_BINARY_PATH is set (user has their own build).
+    """
+    if get_local_binary_override():
+        return
+
+    tag = get_platform_tag()  # raises if platform unsupported entirely
+    if tag not in AVAILABLE_PLATFORMS:
+        available = ", ".join(sorted(AVAILABLE_PLATFORMS))
+        import sys
+        sys.exit(
+            f"\n\033[1mCloakBrowser\033[0m — Pre-built binaries are currently only available for: {available}.\n\n"
+            f"To use CloakBrowser now, set CLOAKBROWSER_BINARY_PATH to a local Chromium binary."
+        )
+
+
+def get_effective_version() -> str:
+    """Return the best available version: auto-updated if available, else platform default.
+
+    Reads a platform-scoped marker file from the cache directory.
+    Returns the platform's hardcoded version if no update has been downloaded.
+    """
+    base = get_chromium_version()
+    # Try platform-scoped marker first, fall back to legacy marker for upgrades from <0.3.0
+    cache = get_cache_dir()
+    for name in (f"latest_version_{get_platform_tag()}", "latest_version"):
+        marker = cache / name
+        if marker.exists():
+            try:
+                version = marker.read_text().strip()
+                if version and _version_newer(version, base):
+                    binary = get_binary_path(version)
+                    if binary.exists():
+                        return version
+            except (ValueError, OSError):
+                pass
+    return base
+
+
+def _version_tuple(v: str) -> tuple[int, ...]:
+    """Parse '145.0.7718.0' into (145, 0, 7718, 0) for comparison."""
+    return tuple(int(x) for x in v.split("."))
+
+
+def _version_newer(a: str, b: str) -> bool:
+    """Return True if version a is strictly newer than version b."""
+    return _version_tuple(a) > _version_tuple(b)
+
+
 # ---------------------------------------------------------------------------
 # Download URL
 # ---------------------------------------------------------------------------
 DOWNLOAD_BASE_URL = os.environ.get(
     "CLOAKBROWSER_DOWNLOAD_URL",
-    "https://github.com/CloakHQ/chromium-stealth-builds/releases/download",
+    "https://cloakbrowser.dev",
+)
+
+GITHUB_API_URL = "https://api.github.com/repos/CloakHQ/cloakbrowser/releases"
+
+GITHUB_DOWNLOAD_BASE_URL = (
+    "https://github.com/CloakHQ/cloakbrowser/releases/download"
 )
 
 
-def get_download_url() -> str:
+def get_download_url(version: str | None = None) -> str:
     """Return the full download URL for the current platform's binary archive."""
+    v = version or get_chromium_version()
     tag = get_platform_tag()
-    return f"{DOWNLOAD_BASE_URL}/v{CHROMIUM_VERSION}/cloakbrowser-{tag}.tar.gz"
+    return f"{DOWNLOAD_BASE_URL}/chromium-v{v}/cloakbrowser-{tag}.tar.gz"
+
+
+def get_fallback_download_url(version: str | None = None) -> str:
+    """Return the GitHub Releases fallback URL for the binary archive."""
+    v = version or get_chromium_version()
+    tag = get_platform_tag()
+    return f"{GITHUB_DOWNLOAD_BASE_URL}/chromium-v{v}/cloakbrowser-{tag}.tar.gz"
 
 
 # ---------------------------------------------------------------------------

cloakbrowser/download.py

@@ -6,20 +6,35 @@ Similar to how Playwright downloads its own bundled Chromium.
 
 from __future__ import annotations
 
+import hashlib
 import logging
 import os
+import platform
 import stat
+import subprocess
 import tarfile
 import tempfile
+import threading
+import time
 from pathlib import Path
 
 import httpx
 
+from ._version import __version__ as _wrapper_version
 from .config import (
     CHROMIUM_VERSION,
+    DOWNLOAD_BASE_URL,
+    GITHUB_API_URL,
+    GITHUB_DOWNLOAD_BASE_URL,
+    _version_newer,
+    check_platform_available,
     get_binary_dir,
     get_binary_path,
+    get_cache_dir,
+    get_chromium_version,
     get_download_url,
+    get_effective_version,
+    get_fallback_download_url,
     get_local_binary_override,
     get_platform_tag,
 )
@@ -29,6 +44,9 @@ logger = logging.getLogger("cloakbrowser")
 # Timeout for download (large binary, allow 10 min)
 DOWNLOAD_TIMEOUT = 600.0
 
+# Auto-update check interval (1 hour)
+UPDATE_CHECK_INTERVAL = 3600
+
 
 def ensure_binary() -> str:
     """Ensure the stealth Chromium binary is available. Download if needed.
@@ -48,20 +66,36 @@ def ensure_binary() -> str:
         logger.info("Using local binary override: %s", local_override)
         return str(path)
 
-    # Check if binary is already cached
-    binary_path = get_binary_path()
+    # Fail fast if no binary available for this platform
+    check_platform_available()
+
+    # Check for auto-updated version first, then fall back to hardcoded
+    effective = get_effective_version()
+    binary_path = get_binary_path(effective)
+
     if binary_path.exists() and _is_executable(binary_path):
-        logger.debug("Binary found in cache: %s", binary_path)
+        logger.debug("Binary found in cache: %s (version %s)", binary_path, effective)
+        _maybe_trigger_update_check()
         return str(binary_path)
 
-    # Download
+    # Fall back to platform's hardcoded version if effective version binary doesn't exist
+    platform_version = get_chromium_version()
+    if effective != platform_version:
+        fallback_path = get_binary_path()
+        if fallback_path.exists() and _is_executable(fallback_path):
+            logger.debug("Binary found in cache: %s", fallback_path)
+            _maybe_trigger_update_check()
+            return str(fallback_path)
+
+    # Download platform's hardcoded version
     logger.info(
         "Stealth Chromium %s not found. Downloading for %s...",
-        CHROMIUM_VERSION,
+        platform_version,
         get_platform_tag(),
     )
     _download_and_extract()
 
+    binary_path = get_binary_path()
     if not binary_path.exists():
         raise RuntimeError(
             f"Download completed but binary not found at expected path: {binary_path}. "
@@ -69,13 +103,21 @@ def ensure_binary() -> str:
             f"https://github.com/CloakHQ/cloakbrowser/issues"
         )
 
+    _maybe_trigger_update_check()
     return str(binary_path)
 
 
-def _download_and_extract() -> None:
-    """Download the binary archive and extract to cache directory."""
-    url = get_download_url()
-    binary_dir = get_binary_dir()
+def _download_and_extract(version: str | None = None) -> None:
+    """Download the binary archive and extract to cache directory.
+
+    Tries the primary server (cloakbrowser.dev) first, falls back to
+    GitHub Releases if the primary is unreachable or returns an error.
+    Verifies SHA-256 checksum before extraction when available.
+    """
+    primary_url = get_download_url(version)
+    fallback_url = get_fallback_download_url(version)
+    binary_dir = get_binary_dir(version)
+    binary_path = get_binary_path(version)
 
     # Create cache dir
     binary_dir.parent.mkdir(parents=True, exist_ok=True)
@@ -85,13 +127,101 @@ def _download_and_extract() -> None:
         tmp_path = Path(tmp.name)
 
     try:
-        _download_file(url, tmp_path)
-        _extract_archive(tmp_path, binary_dir)
+        # Try primary, fall back to GitHub Releases (skip fallback if custom URL)
+        try:
+            _download_file(primary_url, tmp_path)
+        except Exception as primary_err:
+            if os.environ.get("CLOAKBROWSER_DOWNLOAD_URL"):
+                raise
+            logger.warning(
+                "Primary download failed (%s), trying GitHub Releases...",
+                primary_err,
+            )
+            _download_file(fallback_url, tmp_path)
+
+        # Verify checksum before extraction
+        if os.environ.get("CLOAKBROWSER_SKIP_CHECKSUM", "").lower() != "true":
+            _verify_download_checksum(tmp_path, version)
+
+        _extract_archive(tmp_path, binary_dir, binary_path)
+        logger.info("Visit https://cloakbrowser.dev for docs and release notifications.")
+        logger.info("Issues? https://github.com/CloakHQ/CloakBrowser/issues")
+        logger.info("Star us if CloakBrowser helps: https://github.com/CloakHQ/CloakBrowser")
     finally:
         # Clean up temp file
         tmp_path.unlink(missing_ok=True)
 
 
+def _verify_download_checksum(file_path: Path, version: str | None = None) -> None:
+    """Fetch SHA256SUMS and verify the downloaded file. Warn if unavailable, fail on mismatch."""
+    checksums = _fetch_checksums(version)
+    tarball_name = f"cloakbrowser-{get_platform_tag()}.tar.gz"
+
+    if checksums is None:
+        logger.warning("SHA256SUMS not available for this release — skipping checksum verification")
+        return
+
+    expected = checksums.get(tarball_name)
+    if expected is None:
+        logger.warning("SHA256SUMS found but no entry for %s — skipping verification", tarball_name)
+        return
+
+    _verify_checksum(file_path, expected)
+
+
+def _fetch_checksums(version: str | None = None) -> dict[str, str] | None:
+    """Fetch SHA256SUMS file for a version. Returns {filename: hash} or None."""
+    v = version or get_chromium_version()
+    has_custom_url = os.environ.get("CLOAKBROWSER_DOWNLOAD_URL")
+
+    # Build URL list — respect custom URL contract (no GitHub fallback)
+    urls = [f"{DOWNLOAD_BASE_URL}/chromium-v{v}/SHA256SUMS"]
+    if not has_custom_url:
+        urls.append(f"{GITHUB_DOWNLOAD_BASE_URL}/chromium-v{v}/SHA256SUMS")
+
+    for url in urls:
+        try:
+            resp = httpx.get(url, follow_redirects=True, timeout=10.0)
+            resp.raise_for_status()
+            return _parse_checksums(resp.text)
+        except Exception:
+            continue
+    return None
+
+
+def _parse_checksums(text: str) -> dict[str, str]:
+    """Parse SHA256SUMS format: 'hash  filename' per line."""
+    result = {}
+    for line in text.strip().splitlines():
+        line = line.strip()
+        if not line:
+            continue
+        parts = line.split(None, 1)
+        if len(parts) == 2:
+            hash_val, filename = parts
+            filename = filename.lstrip("*")
+            result[filename] = hash_val.lower()
+    return result
+
+
+def _verify_checksum(file_path: Path, expected_hash: str) -> None:
+    """Verify SHA-256 of a file. Raises RuntimeError on mismatch."""
+    sha256 = hashlib.sha256()
+    with open(file_path, "rb") as f:
+        for chunk in iter(lambda: f.read(8192), b""):
+            sha256.update(chunk)
+    actual = sha256.hexdigest().lower()
+    if actual != expected_hash:
+        raise RuntimeError(
+            f"Checksum verification failed!\n"
+            f"  Expected: {expected_hash}\n"
+            f"  Got:      {actual}\n"
+            f"  File may be corrupted or tampered with. "
+            f"Please retry or report at https://github.com/CloakHQ/cloakbrowser/issues"
+        )
+    logger.info("Checksum verified: SHA-256 OK")
+
+
 def _download_file(url: str, dest: Path) -> None:
     """Download a file with progress logging."""
     logger.info("Downloading from %s", url)
@@ -123,7 +253,9 @@ def _download_file(url: str, dest: Path) -> None:
     logger.info("Download complete: %d MB", dest.stat().st_size // (1024 * 1024))
 
 
-def _extract_archive(archive_path: Path, dest_dir: Path) -> None:
+def _extract_archive(
+    archive_path: Path, dest_dir: Path, binary_path: Path | None = None
+) -> None:
     """Extract tar.gz archive to destination directory."""
     logger.info("Extracting to %s", dest_dir)
 
@@ -135,28 +267,40 @@ def _extract_archive(archive_path: Path, dest_dir: Path) -> None:
     dest_dir.mkdir(parents=True, exist_ok=True)
 
     with tarfile.open(archive_path, "r:gz") as tar:
-        # Security: prevent path traversal and symlink attacks
+        # Security: prevent path traversal
         safe_members = []
         for member in tar.getmembers():
+            # Allow symlinks — macOS .app bundles require them (Framework layout)
             if member.issym() or member.islnk():
-                logger.warning("Skipping symlink in archive: %s", member.name)
-                continue
-            member_path = (dest_dir / member.name).resolve()
-            if not str(member_path).startswith(str(dest_dir.resolve())):
-                raise RuntimeError(f"Archive contains path traversal: {member.name}")
+                link_target = member.linkname
+                # Reject symlinks that escape the dest dir
+                if os.path.isabs(link_target) or ".." in link_target.split("/"):
+                    logger.warning("Skipping suspicious symlink: %s -> %s", member.name, link_target)
+                    continue
+            else:
+                member_path = (dest_dir / member.name).resolve()
+                if not str(member_path).startswith(str(dest_dir.resolve())):
+                    raise RuntimeError(f"Archive contains path traversal: {member.name}")
             safe_members.append(member)
 
         tar.extractall(dest_dir, members=safe_members)
 
     # If tar extracted into a single subdirectory, flatten it
     # (e.g. fingerprint-chromium-142-custom-v2/chrome → chrome)
+    # But never flatten .app bundles — macOS needs the bundle structure intact
     _flatten_single_subdir(dest_dir)
 
     # Make binary executable
-    binary_path = get_binary_path()
-    if binary_path.exists():
-        _make_executable(binary_path)
-        logger.info("Binary ready: %s", binary_path)
+    bp = binary_path or get_binary_path()
+    if bp.exists():
+        _make_executable(bp)
+
+    # macOS: remove quarantine/provenance xattrs to prevent Gatekeeper prompts
+    if platform.system() == "Darwin":
+        _remove_quarantine(dest_dir)
+
+    if bp.exists():
+        logger.info("Binary ready: %s", bp)
 
 
 def _flatten_single_subdir(dest_dir: Path) -> None:
@@ -170,6 +314,10 @@ def _flatten_single_subdir(dest_dir: Path) -> None:
     entries = list(dest_dir.iterdir())
     if len(entries) == 1 and entries[0].is_dir():
         subdir = entries[0]
+        # Never flatten .app bundles — macOS needs the bundle structure
+        if subdir.name.endswith(".app"):
+            logger.debug("Keeping .app bundle intact: %s", subdir.name)
+            return
         logger.debug("Flattening single subdirectory: %s", subdir.name)
         for item in subdir.iterdir():
             shutil.move(str(item), str(dest_dir / item.name))
@@ -182,11 +330,26 @@ def _is_executable(path: Path) -> bool:
 
 
 def _make_executable(path: Path) -> None:
-    """Make a file executable (chmod +x)."""
+    """Make a file executable (chmod +x). Skipped on Windows (no-op / AV lock risk)."""
+    if platform.system() == "Windows":
+        return
     current = path.stat().st_mode
     path.chmod(current | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)
 
 
+def _remove_quarantine(path: Path) -> None:
+    """Remove macOS quarantine/provenance xattrs so Gatekeeper doesn't block the binary."""
+    try:
+        subprocess.run(
+            ["xattr", "-cr", str(path)],
+            capture_output=True,
+            timeout=30,
+        )
+        logger.debug("Removed quarantine attributes from %s", path)
+    except Exception:
+        logger.debug("Failed to remove quarantine attributes", exc_info=True)
+
+
 def clear_cache() -> None:
     """Remove all cached binaries. Forces re-download on next launch."""
     from .config import get_cache_dir
@@ -200,12 +363,177 @@ def clear_cache() -> None:
 
 def binary_info() -> dict:
     """Return info about the current binary installation."""
-    binary_path = get_binary_path()
+    effective = get_effective_version()
+    binary_path = get_binary_path(effective)
     return {
-        "version": CHROMIUM_VERSION,
+        "version": effective,
+        "bundled_version": CHROMIUM_VERSION,
         "platform": get_platform_tag(),
         "binary_path": str(binary_path),
         "installed": binary_path.exists(),
-        "cache_dir": str(get_binary_dir()),
-        "download_url": get_download_url(),
+        "cache_dir": str(get_binary_dir(effective)),
+        "download_url": get_download_url(effective),
     }
+
+
+# ---------------------------------------------------------------------------
+# Auto-update
+# ---------------------------------------------------------------------------
+
+def check_for_update() -> str | None:
+    """Manually check for a newer Chromium version. Returns new version or None.
+
+    This is the public API for triggering an update check. Unlike the
+    background check in ensure_binary(), this blocks until complete.
+    """
+    latest = _get_latest_chromium_version()
+    if latest is None:
+        return None
+    if not _version_newer(latest, get_chromium_version()):
+        return None
+
+    binary_dir = get_binary_dir(latest)
+    if binary_dir.exists():
+        # Already downloaded
+        _write_version_marker(latest)
+        return latest
+
+    logger.info("Downloading Chromium %s...", latest)
+    _download_and_extract(version=latest)
+    _write_version_marker(latest)
+    return latest
+
+
+def _should_check_for_update() -> bool:
+    """Check if auto-update is enabled and rate limit hasn't been hit."""
+    if os.environ.get("CLOAKBROWSER_AUTO_UPDATE", "").lower() == "false":
+        return False
+    if get_local_binary_override():
+        return False
+    if os.environ.get("CLOAKBROWSER_DOWNLOAD_URL"):
+        return False
+
+    check_file = get_cache_dir() / ".last_update_check"
+    if check_file.exists():
+        try:
+            last_check = float(check_file.read_text().strip())
+            if time.time() - last_check < UPDATE_CHECK_INTERVAL:
+                return False
+        except (ValueError, OSError):
+            pass
+    return True
+
+
+def _get_latest_chromium_version() -> str | None:
+    """Hit GitHub Releases API, return latest chromium-v* version for this platform.
+
+    Checks that the release has a binary asset for the current platform,
+    so Linux-only releases won't be offered to macOS users.
+    """
+    try:
+        resp = httpx.get(
+            GITHUB_API_URL, params={"per_page": 10}, timeout=10.0
+        )
+        resp.raise_for_status()
+        platform_tarball = f"cloakbrowser-{get_platform_tag()}.tar.gz"
+        for release in resp.json():
+            tag = release.get("tag_name", "")
+            if tag.startswith("chromium-v") and not release.get("draft"):
+                asset_names = {a["name"] for a in release.get("assets", [])}
+                if platform_tarball in asset_names:
+                    return tag.removeprefix("chromium-v")
+        return None
+    except Exception:
+        logger.debug("Auto-update check failed", exc_info=True)
+        return None
+
+
+def _write_version_marker(version: str) -> None:
+    """Write the latest version marker for this platform to cache dir."""
+    cache_dir = get_cache_dir()
+    cache_dir.mkdir(parents=True, exist_ok=True)
+    marker = cache_dir / f"latest_version_{get_platform_tag()}"
+    # Write to temp file then rename for atomicity
+    tmp = marker.with_suffix(".tmp")
+    tmp.write_text(version)
+    tmp.rename(marker)
+
+
+_wrapper_update_checked = False
+
+
+def _check_wrapper_update() -> None:
+    """Check PyPI for a newer wrapper version. Runs once per process."""
+    global _wrapper_update_checked
+    if _wrapper_update_checked:
+        return
+    _wrapper_update_checked = True
+    if os.environ.get("CLOAKBROWSER_AUTO_UPDATE", "").lower() == "false":
+        return
+    if os.environ.get("CLOAKBROWSER_DOWNLOAD_URL"):
+        return
+    try:
+        resp = httpx.get(
+            "https://pypi.org/pypi/cloakbrowser/json",
+            timeout=5.0,
+        )
+        resp.raise_for_status()
+        latest = resp.json()["info"]["version"]
+        if _version_newer(latest, _wrapper_version):
+            logger.warning(
+                "Update available: cloakbrowser %s → %s. "
+                "Run: pip install --upgrade cloakbrowser",
+                _wrapper_version,
+                latest,
+            )
+    except Exception:
+        logger.debug("Wrapper update check failed", exc_info=True)
+
+
+def _check_and_download_update() -> None:
+    """Background task: check for newer binary, download if available."""
+    try:
+        # Record check timestamp first (rate limiting)
+        check_file = get_cache_dir() / ".last_update_check"
+        check_file.parent.mkdir(parents=True, exist_ok=True)
+        check_file.write_text(str(time.time()))
+
+        platform_version = get_chromium_version()
+        latest = _get_latest_chromium_version()
+        if latest is None:
+            return
+        if not _version_newer(latest, platform_version):
+            return
+
+        # Already downloaded?
+        if get_binary_dir(latest).exists():
+            _write_version_marker(latest)
+            return
+
+        logger.info(
+            "Newer Chromium available: %s (current: %s). Downloading in background...",
+            latest,
+            platform_version,
+        )
+        _download_and_extract(version=latest)
+        _write_version_marker(latest)
+        logger.info(
+            "Background update complete: Chromium %s ready. Will use on next launch.",
+            latest,
+        )
+    except Exception:
+        logger.debug("Background update failed", exc_info=True)
+
+
+def _maybe_trigger_update_check() -> None:
+    """Fire-and-forget update check in a daemon thread."""
+    # Wrapper update: once per process, not rate-limited
+    if not _wrapper_update_checked:
+        t = threading.Thread(target=_check_wrapper_update, daemon=True)
+        t.start()
+
+    # Binary update: rate-limited to once per hour
+    if not _should_check_for_update():
+        return
+    t = threading.Thread(target=_check_and_download_update, daemon=True)
+    t.start()

cloakbrowser/geoip.py

@@ -0,0 +1,238 @@
+"""GeoIP-based timezone and locale detection from proxy IP.
+
+Optional feature — requires ``geoip2`` package::
+
+    pip install cloakbrowser[geoip]
+
+Downloads GeoLite2-City.mmdb (~70 MB) on first use, caches in
+``~/.cloakbrowser/geoip/``.  Background re-download after 30 days.
+"""
+
+from __future__ import annotations
+
+import ipaddress
+import logging
+import socket
+import tempfile
+import threading
+import time
+from pathlib import Path
+from urllib.parse import urlparse
+
+logger = logging.getLogger("cloakbrowser")
+
+# P3TERX mirror of MaxMind GeoLite2-City — no license key needed
+GEOIP_DB_URL = (
+    "https://github.com/P3TERX/GeoLite.mmdb/raw/download/GeoLite2-City.mmdb"
+)
+GEOIP_DB_FILENAME = "GeoLite2-City.mmdb"
+GEOIP_UPDATE_INTERVAL = 30 * 86_400  # 30 days
+
+# Country ISO code → BCP 47 locale (covers ~90 % of proxy traffic)
+COUNTRY_LOCALE_MAP: dict[str, str] = {
+    "US": "en-US", "GB": "en-GB", "AU": "en-AU", "CA": "en-CA", "NZ": "en-NZ",
+    "IE": "en-IE", "ZA": "en-ZA", "SG": "en-SG",
+    "DE": "de-DE", "AT": "de-AT", "CH": "de-CH",
+    "FR": "fr-FR", "BE": "fr-BE",
+    "ES": "es-ES", "MX": "es-MX", "AR": "es-AR", "CO": "es-CO", "CL": "es-CL",
+    "BR": "pt-BR", "PT": "pt-PT",
+    "IT": "it-IT", "NL": "nl-NL",
+    "JP": "ja-JP", "KR": "ko-KR", "CN": "zh-CN", "TW": "zh-TW", "HK": "zh-HK",
+    "RU": "ru-RU", "UA": "uk-UA", "PL": "pl-PL", "CZ": "cs-CZ", "RO": "ro-RO",
+    "IL": "he-IL", "TR": "tr-TR", "SA": "ar-SA", "AE": "ar-AE", "EG": "ar-EG",
+    "IN": "hi-IN", "ID": "id-ID", "PH": "en-PH",
+    "TH": "th-TH", "VN": "vi-VN", "MY": "ms-MY",
+    "SE": "sv-SE", "NO": "nb-NO", "DK": "da-DK", "FI": "fi-FI",
+    "GR": "el-GR", "HU": "hu-HU", "BG": "bg-BG",
+}
+
+
+def resolve_proxy_geo(proxy_url: str) -> tuple[str | None, str | None]:
+    """Resolve timezone and locale from a proxy's IP address.
+
+    Returns ``(timezone, locale)`` — either or both may be ``None`` on
+    failure (missing dep, DB download error, lookup miss).  Never raises.
+    """
+    try:
+        import geoip2.database  # noqa: F811
+    except ImportError:
+        raise ImportError(
+            "geoip2 is required for geoip=True. Install it with:\n"
+            "  pip install cloakbrowser[geoip]"
+        ) from None
+
+    db_path = _ensure_geoip_db()
+    if db_path is None:
+        return None, None
+
+    # Exit IP (through proxy) is most accurate — gateway DNS may differ from exit
+    ip = _resolve_exit_ip(proxy_url)
+    if ip is None:
+        ip = _resolve_proxy_ip(proxy_url)
+    if ip is None:
+        return None, None
+
+    try:
+        with geoip2.database.Reader(str(db_path)) as reader:
+            resp = reader.city(ip)
+            timezone = resp.location.time_zone
+            country = resp.country.iso_code
+            locale = COUNTRY_LOCALE_MAP.get(country) if country else None
+            logger.debug(
+                "GeoIP: %s → tz=%s, country=%s, locale=%s",
+                ip, timezone, country, locale,
+            )
+            return timezone, locale
+    except Exception as exc:
+        logger.debug("GeoIP lookup failed for %s: %s", ip, exc)
+        return None, None
+
+
+# ---------------------------------------------------------------------------
+# Proxy IP resolution
+# ---------------------------------------------------------------------------
+
+
+def _resolve_proxy_ip(proxy_url: str) -> str | None:
+    """Extract proxy hostname from URL and resolve to an IP address."""
+    try:
+        hostname = urlparse(proxy_url).hostname
+        if not hostname:
+            return None
+
+        # Already a literal IP?
+        try:
+            socket.inet_pton(socket.AF_INET, hostname)
+            return hostname
+        except OSError:
+            pass
+        try:
+            socket.inet_pton(socket.AF_INET6, hostname)
+            return hostname
+        except OSError:
+            pass
+
+        # DNS resolve (returns first result, handles both v4/v6)
+        results = socket.getaddrinfo(hostname, None, socket.AF_UNSPEC, socket.SOCK_STREAM)
+        if results:
+            ip = results[0][4][0]
+            logger.debug("Resolved proxy %s → %s", hostname, ip)
+            return ip
+        return None
+    except Exception as exc:
+        logger.debug("Failed to resolve proxy hostname: %s", exc)
+        return None
+
+
+def _is_private_ip(ip: str) -> bool:
+    """Check if an IP address is private/internal (not routable on the internet)."""
+    try:
+        return ipaddress.ip_address(ip).is_private
+    except ValueError:
+        return False
+
+
+# IP echo services — fast, no auth, return just the IP
+_IP_ECHO_URLS = [
+    "https://api.ipify.org",
+    "https://checkip.amazonaws.com",
+    "https://ifconfig.me/ip",
+]
+
+
+def _resolve_exit_ip(proxy_url: str) -> str | None:
+    """Discover the proxy's actual exit IP by connecting through it."""
+    import httpx
+
+    for url in _IP_ECHO_URLS:
+        try:
+            resp = httpx.get(url, proxy=proxy_url, timeout=10.0)
+            resp.raise_for_status()
+            ip = resp.text.strip()
+            # Validate it looks like an IP
+            ipaddress.ip_address(ip)
+            logger.debug("Exit IP via %s: %s", url, ip)
+            return ip
+        except Exception:
+            continue
+    logger.debug("Failed to discover exit IP through proxy")
+    return None
+
+
+# ---------------------------------------------------------------------------
+# GeoIP database management
+# ---------------------------------------------------------------------------
+
+
+def _get_geoip_dir() -> Path:
+    from .config import get_cache_dir
+
+    return get_cache_dir() / "geoip"
+
+
+def _ensure_geoip_db() -> Path | None:
+    """Return path to GeoLite2-City.mmdb, downloading on first use."""
+    db_path = _get_geoip_dir() / GEOIP_DB_FILENAME
+
+    if db_path.exists():
+        _maybe_trigger_update(db_path)
+        return db_path
+
+    try:
+        _download_geoip_db(db_path)
+        return db_path
+    except Exception as exc:
+        logger.warning("Failed to download GeoIP database: %s", exc)
+        return None
+
+
+def _download_geoip_db(dest: Path) -> None:
+    """Atomic download of GeoLite2-City.mmdb via httpx."""
+    import httpx
+
+    dest.parent.mkdir(parents=True, exist_ok=True)
+    logger.info("Downloading GeoIP database (~70 MB) …")
+
+    tmp_fd, tmp_name = tempfile.mkstemp(dir=dest.parent, suffix=".tmp")
+    tmp_path = Path(tmp_name)
+    try:
+        with httpx.stream(
+            "GET", GEOIP_DB_URL, follow_redirects=True, timeout=300.0
+        ) as resp:
+            resp.raise_for_status()
+            total = int(resp.headers.get("content-length", 0))
+            downloaded = 0
+            last_pct = -1
+            with open(tmp_fd, "wb") as f:
+                for chunk in resp.iter_bytes(chunk_size=65_536):
+                    f.write(chunk)
+                    downloaded += len(chunk)
+                    if total:
+                        pct = downloaded * 100 // total
+                        if pct >= last_pct + 10:
+                            last_pct = pct
+                            logger.info("GeoIP download: %d %%", pct)
+
+        tmp_path.rename(dest)
+        logger.info("GeoIP database ready: %s", dest)
+    except Exception:
+        tmp_path.unlink(missing_ok=True)
+        raise
+
+
+def _maybe_trigger_update(db_path: Path) -> None:
+    """Re-download in background if DB is older than 30 days."""
+    try:
+        age = time.time() - db_path.stat().st_mtime
+        if age < GEOIP_UPDATE_INTERVAL:
+            return
+    except OSError:
+        return
+
+    def _bg() -> None:
+        try:
+            _download_geoip_db(db_path)
+        except Exception:
+            logger.debug("Background GeoIP update failed", exc_info=True)
+
+    threading.Thread(target=_bg, daemon=True).start()

examples/fingerprint_scan_test.py

@@ -0,0 +1,228 @@
+"""Test against fingerprint-scan.com and CreepJS.
+
+Tests the specific headless detection signals flagged by the community:
+- noTaskbar, noContentIndex, noContactsManager, noDownlinkMax
+- Bot risk score (fingerprint-scan.com)
+- Headless/stealth percentages (CreepJS)
+- Full CreepJS signal breakdown (likeHeadless, headless, stealth)
+
+Usage:
+    python examples/fingerprint_scan_test.py
+    python examples/fingerprint_scan_test.py --proxy http://10.50.96.5:8888
+    python examples/fingerprint_scan_test.py --headless
+"""
+
+import sys
+import time
+
+from cloakbrowser import launch_context
+
+HEADLESS = "--headless" in sys.argv
+PROXY = None
+for i, arg in enumerate(sys.argv):
+    if arg == "--proxy" and i + 1 < len(sys.argv):
+        PROXY = sys.argv[i + 1]
+
+
+def test_fingerprint_scan(page):
+    """fingerprint-scan.com — bot risk score + headless detection signals."""
+    print("=== fingerprint-scan.com ===")
+    page.goto("https://fingerprint-scan.com/", wait_until="domcontentloaded", timeout=30000)
+    time.sleep(20)  # Castle.js needs time to compute score
+
+    # Check bot risk score
+    score = page.evaluate(
+        'document.getElementById("fingerprintScore")?.textContent || "Score not rendered"'
+    )
+    print(f"Bot Risk Score: {score}")
+
+    # Check headless detection signals
+    apis = page.evaluate("""() => ({
+        noTaskbar: screen.height === screen.availHeight,
+        taskbarSize: screen.height - screen.availHeight,
+        noContentIndex: typeof window.ContentIndex === "undefined",
+        noContactsManager: !("contacts" in navigator),
+        noDownlinkMax: !("downlinkMax" in (navigator.connection || {})),
+        downlinkMax: navigator.connection?.downlinkMax ?? null,
+        timezone: Intl.DateTimeFormat().resolvedOptions().timeZone,
+        webdriver: navigator.webdriver,
+        isPlaywright: "__pwInitScripts" in window || "__playwright__binding__" in window,
+        webgpu: typeof navigator.gpu !== "undefined" ? "available" : "NOT_AVAILABLE",
+        scrollbarWidth: (() => { const d = document.createElement("div"); d.style.cssText = "overflow:scroll;width:100px;height:100px;position:absolute;top:-999px"; document.body.appendChild(d); const w = d.offsetWidth - d.clientWidth; d.remove(); return w; })()
+    })""")
+
+    print("\nHeadless detection signals:")
+    headless_fails = 0
+    for k, v in apis.items():
+        is_fail = k.startswith("no") and v is True
+        if is_fail:
+            headless_fails += 1
+        flag = "FAIL" if is_fail else ""
+        print(f"  {k}: {v}  {flag}")
+
+    # Extract bot test results from page
+    bot_tests = page.evaluate("""() => {
+        const text = document.body.innerText;
+        const tests = {};
+        for (const key of ['WebDriver', 'Is Selenium Chrome', 'CDP Check', 'Is Playwright']) {
+            const match = text.match(new RegExp(key + '\\\\s+(true|false)'));
+            if (match) tests[key] = match[1];
+        }
+        return tests;
+    }""")
+    print("\nBot Detection Tests:")
+    for k, v in bot_tests.items():
+        status = "PASS" if v == "false" else "FAIL"
+        print(f"  {k}: {v}  [{status}]")
+
+    page.screenshot(path="/results/fingerprint-scan.png", full_page=True)
+    print("\nScreenshot: /results/fingerprint-scan.png")
+
+    return {
+        "score": score,
+        "headless_fails": headless_fails,
+        "apis": apis,
+        "bot_tests": bot_tests,
+    }
+
+
+def test_creepjs(page):
+    """abrahamjuliot.github.io/creepjs — comprehensive fingerprint analysis."""
+    print("\n=== CreepJS ===")
+    page.goto(
+        "https://abrahamjuliot.github.io/creepjs/", wait_until="domcontentloaded", timeout=30000
+    )
+    print("Waiting 30s for CreepJS analysis...")
+    time.sleep(30)
+
+    # Extract % scores from page text (matches test-infra/matrix_tests/group3_bot_detection.py)
+    scores = page.evaluate("""() => {
+        const text = document.body.innerText;
+        const likeMatch = text.match(/(\\d+)%\\s*like headless/i);
+        const headlessMatch = text.match(/(\\d+)%\\s*headless:/i);
+        const stealthMatch = text.match(/(\\d+)%\\s*stealth:/i);
+        return {
+            likeHeadlessPct: likeMatch ? parseInt(likeMatch[1]) : null,
+            headlessPct: headlessMatch ? parseInt(headlessMatch[1]) : null,
+            stealthPct: stealthMatch ? parseInt(stealthMatch[1]) : null,
+        };
+    }""")
+
+    print(f"\nScores:")
+    print(f"  like-headless: {scores['likeHeadlessPct']}%  (target: <=30%)")
+    print(f"  headless:      {scores['headlessPct']}%  (target: 0%)")
+    print(f"  stealth:       {scores['stealthPct']}%  (target: 0%)")
+
+    # Extract full signal breakdown from window.Fingerprint.headless (CreepJS internal object)
+    signals = page.evaluate("""() => {
+        try {
+            const fp = window.Fingerprint;
+            if (!fp || !fp.headless) return null;
+            return {
+                likeHeadless: fp.headless.likeHeadless || null,
+                headless: fp.headless.headless || null,
+                stealth: fp.headless.stealth || null,
+            };
+        } catch { return null; }
+    }""")
+
+    if signals:
+        if signals.get("likeHeadless"):
+            print("\nlikeHeadless signals:")
+            fails = 0
+            for k, v in signals["likeHeadless"].items():
+                is_fail = v is True
+                if is_fail:
+                    fails += 1
+                flag = " FAIL" if is_fail else ""
+                print(f"  {k}: {v}{flag}")
+            print(f"  ({fails} fails)")
+
+        if signals.get("headless"):
+            print("\nheadless signals:")
+            for k, v in signals["headless"].items():
+                flag = " FAIL" if v is True else ""
+                print(f"  {k}: {v}{flag}")
+
+        if signals.get("stealth"):
+            print("\nstealth signals:")
+            for k, v in signals["stealth"].items():
+                flag = " FAIL" if v is True else ""
+                print(f"  {k}: {v}{flag}")
+    else:
+        print("\n(window.Fingerprint.headless not available — signals not extracted)")
+
+    # Extract platform estimate
+    platform = page.evaluate("""() => {
+        try {
+            const fp = window.Fingerprint;
+            if (!fp || !fp.platformEstimate) return null;
+            return fp.platformEstimate;
+        } catch { return null; }
+    }""")
+    if platform:
+        print(f"\nPlatform estimate: {platform}")
+
+    passed = (
+        scores["headlessPct"] is not None
+        and scores["headlessPct"] <= 30
+        and scores["stealthPct"] is not None
+        and scores["stealthPct"] <= 30
+    )
+    print(f"\nVerdict: {'PASS' if passed else 'FAIL'} (<=30% headless, <=30% stealth)")
+
+    page.screenshot(path="/results/creepjs.png", full_page=True)
+    print("Screenshot: /results/creepjs.png")
+
+    return {**scores, "signals": signals, "platform": platform}
+
+
+def main():
+    print("=" * 60)
+    print("CloakBrowser — Fingerprint & Headless Detection Tests")
+    print("=" * 60)
+    print(f"Mode: {'headless' if HEADLESS else 'headed'}")
+    print(f"Proxy: {PROXY or 'none'}")
+    print()
+
+    context = launch_context(
+        headless=HEADLESS,
+        proxy=PROXY,
+        args=[
+            "--fingerprint-screen-width=1920",
+            "--fingerprint-screen-height=1080",
+            "--fingerprint-timezone=Asia/Jerusalem",
+        ],
+    )
+    page = context.new_page()
+
+    try:
+        fp_result = test_fingerprint_scan(page)
+        creep_result = test_creepjs(page)
+    finally:
+        context.close()
+
+    # Summary
+    print("\n" + "=" * 60)
+    print("SUMMARY")
+    print("=" * 60)
+    print(f"fingerprint-scan.com: {fp_result['score']}")
+    print(f"  Headless signal fails: {fp_result['headless_fails']}")
+    like = creep_result["likeHeadlessPct"]
+    headless = creep_result["headlessPct"]
+    stealth = creep_result["stealthPct"]
+    print(f"CreepJS: like-headless={like}%, headless={headless}%, stealth={stealth}%")
+
+    # Count CreepJS signal fails
+    sigs = creep_result.get("signals")
+    if sigs and sigs.get("likeHeadless"):
+        fail_names = [k for k, v in sigs["likeHeadless"].items() if v is True]
+        if fail_names:
+            print(f"  likeHeadless fails: {', '.join(fail_names)}")
+    print("=" * 60)
+
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

examples/recaptcha_score.py

@@ -5,6 +5,8 @@ Expected: 0.9 (human-level) with cloakbrowser.
 Default Playwright typically scores 0.1-0.3.
 """
 
+import time
+
 from cloakbrowser import launch
 
 browser = launch(headless=True)
@@ -18,7 +20,7 @@ page.wait_for_load_state("networkidle")
 button = page.query_selector("button")
 if button:
     button.click()
-    page.wait_for_timeout(3000)
+    time.sleep(3)
 
 # Extract score from page
 content = page.content()

examples/stealth_test.py

@@ -1,57 +1,275 @@
 """Run stealth tests against major bot detection services.
 
-Tests cloakbrowser against multiple detection sites and reports results.
+Tests cloakbrowser against multiple detection sites, extracts pass/fail
+verdicts via JS evaluation, and reports results with screenshots.
+
+Usage:
+    python examples/stealth_test.py
+    python examples/stealth_test.py --headed     # watch in real-time
+    python examples/stealth_test.py --no-screenshots
+    python examples/stealth_test.py --proxy http://10.50.96.5:8888
 """
 
+import json
+import sys
+import time
+
 from cloakbrowser import launch
 
+HEADED = "--headed" in sys.argv
+SCREENSHOTS = "--no-screenshots" not in sys.argv
+PROXY = None
+for i, arg in enumerate(sys.argv):
+    if arg == "--proxy" and i + 1 < len(sys.argv):
+        PROXY = sys.argv[i + 1]
+
+
+def test_bot_sannysoft(page):
+    """bot.sannysoft.com — classic bot detection checks."""
+    page.goto("https://bot.sannysoft.com", wait_until="networkidle", timeout=30000)
+    time.sleep(3)
+
+    results = page.evaluate("""() => {
+        const rows = document.querySelectorAll('table tr');
+        const data = {};
+        rows.forEach(r => {
+            const cells = r.querySelectorAll('td');
+            if (cells.length >= 2) {
+                const key = cells[0].innerText.trim();
+                const val = cells[1].innerText.trim();
+                const cls = cells[1].className || '';
+                data[key] = {value: val, passed: !cls.includes('failed')};
+            }
+        });
+        return data;
+    }""")
+
+    failed = [k for k, v in results.items() if not v["passed"]]
+    total = len(results)
+    passed = total - len(failed)
+    return {"passed": passed, "total": total, "failed": failed}
+
+
+def test_bot_incolumitas(page):
+    """bot.incolumitas.com — comprehensive 30+ check bot detection."""
+    page.goto("https://bot.incolumitas.com", wait_until="networkidle", timeout=30000)
+    time.sleep(12)  # needs time to run all detection tests
+
+    # Site outputs JSON blocks in page text, not HTML tables
+    results = page.evaluate("""() => {
+        const text = document.body.innerText;
+        const okMatches = text.match(/"\\w+":\\s*"OK"/g) || [];
+        const failMatches = text.match(/"\\w+":\\s*"FAIL"/g) || [];
+        const failedTests = failMatches.map(m => m.match(/"(\\w+)"/)[1]);
+        return {
+            passed: okMatches.length,
+            failed: failMatches.length,
+            failedTests,
+            total: okMatches.length + failMatches.length
+        };
+    }""")
+    return results
+
+
+def test_browserscan(page):
+    """browserscan.net/bot-detection — WebDriver, UA, CDP, Navigator checks."""
+    page.goto("https://www.browserscan.net/bot-detection", wait_until="networkidle", timeout=30000)
+    time.sleep(5)
+
+    results = page.evaluate("""() => {
+        const items = document.querySelectorAll('[class*="result"], [class*="item"], [class*="check"]');
+        let normal = 0, abnormal = 0;
+        const text = document.body.innerText;
+        // Count "Normal" vs "Abnormal" verdicts
+        const normalMatches = text.match(/Normal/g);
+        const abnormalMatches = text.match(/Abnormal/g);
+        return {
+            normal: normalMatches ? normalMatches.length : 0,
+            abnormal: abnormalMatches ? abnormalMatches.length : 0,
+            pageText: text.substring(0, 500)
+        };
+    }""")
+    return results
+
+
+def test_deviceandbrowserinfo(page):
+    """deviceandbrowserinfo.com/are_you_a_bot — fingerprint + behavioral detection."""
+    page.goto("https://deviceandbrowserinfo.com/are_you_a_bot", wait_until="domcontentloaded", timeout=30000)
+    time.sleep(8)
+
+    results = page.evaluate("""() => {
+        const text = document.body.innerText;
+        // Site outputs JSON with "isBot": false and detail checks
+        const botMatch = text.match(/"isBot":\\s*(true|false)/);
+        const isBot = botMatch ? botMatch[1] === 'true' : null;
+        const checks = {};
+        const patterns = [
+            'isBot', 'hasBotUserAgent', 'hasWebdriverTrue',
+            'isHeadlessChrome', 'isAutomatedWithCDP', 'hasSuspiciousWeakSignals',
+            'isPlaywright', 'hasInconsistentChromeObject'
+        ];
+        patterns.forEach(p => {
+            const match = text.match(new RegExp('"' + p + '":\\s*(true|false)'));
+            if (match) checks[p] = match[1] === 'true';
+        });
+        return {isBot, checks};
+    }""")
+    return results
+
+
+def test_fingerprintjs(page):
+    """demo.fingerprint.com/web-scraping — industry-standard bot detection."""
+    page.goto("https://demo.fingerprint.com/web-scraping", wait_until="domcontentloaded", timeout=30000)
+    time.sleep(8)
+
+    # Click search to trigger bot detection — bots get blocked, humans see flights
+    try:
+        page.click("button:has-text('Search')", timeout=5000)
+        time.sleep(5)
+    except Exception:
+        pass
+
+    results = page.evaluate("""() => {
+        const text = document.body.innerText;
+        // Bots see error messages; humans see flight prices
+        const hasFlights = text.includes('Price per adult') || text.includes('$');
+        const isBlocked = text.includes('request was blocked') || text.includes('bot visit detected');
+        return {passed: hasFlights && !isBlocked, isBlocked, hasFlights};
+    }""")
+    return results
+
+
+def test_recaptcha(page):
+    """recaptcha-demo.appspot.com — Google's official reCAPTCHA v3 score."""
+    page.goto(
+        "https://recaptcha-demo.appspot.com/recaptcha-v3-request-scores.php",
+        wait_until="domcontentloaded",
+        timeout=30000,
+    )
+    # Wait for backend response (step3 element appears when score arrives)
+    try:
+        page.wait_for_selector("li.step3", timeout=20000)
+        time.sleep(1)
+    except Exception:
+        time.sleep(10)  # fallback
+
+    results = page.evaluate("""() => {
+        const text = document.body.innerText;
+        // Score appears in JSON response block: "score": 0.9
+        const scoreMatch = text.match(/"score":\\s*(\\d+\\.\\d+)/);
+        return {
+            score: scoreMatch ? parseFloat(scoreMatch[1]) : null,
+            pageText: text.substring(0, 500)
+        };
+    }""")
+    return results
+
+
 TESTS = [
+    {
+        "name": "bot.sannysoft.com",
+        "url": "https://bot.sannysoft.com",
+        "runner": test_bot_sannysoft,
+        "verdict": lambda r: f"{r['passed']}/{r['total']} passed"
+            + (f" (FAILED: {', '.join(r['failed'])})" if r["failed"] else " — ALL GREEN"),
+        "pass": lambda r: len(r["failed"]) == 0,
+    },
     {
         "name": "bot.incolumitas.com",
         "url": "https://bot.incolumitas.com",
-        "check": "Bot detection analysis",
+        "runner": test_bot_incolumitas,
+        "verdict": lambda r: f"{r['passed']}/{r['total']} passed"
+            + (f" (FAILED: {', '.join(r.get('failedTests', []))})" if r.get("failed", 0) > 0 else " — ALL GREEN"),
+        "pass": lambda r: r.get("failed", 0) <= 1,  # fpscanner.WEBDRIVER false positive expected (all builds)
     },
     {
         "name": "BrowserScan",
         "url": "https://www.browserscan.net/bot-detection",
-        "check": "Bot detection status",
+        "runner": test_browserscan,
+        "verdict": lambda r: f"Normal: {r['normal']}, Abnormal: {r['abnormal']}",
+        "pass": lambda r: r.get("abnormal", 1) == 0,
     },
     {
         "name": "deviceandbrowserinfo.com",
         "url": "https://deviceandbrowserinfo.com/are_you_a_bot",
-        "check": "isBot flag",
+        "runner": test_deviceandbrowserinfo,
+        "verdict": lambda r: f"isBot: {r.get('isBot', 'unknown')}"
+            + (f" checks: {json.dumps(r.get('checks', {}))}" if r.get("checks") else ""),
+        "pass": lambda r: not r.get("isBot", True),
     },
     {
         "name": "FingerprintJS",
         "url": "https://demo.fingerprint.com/web-scraping",
-        "check": "Bot detection result",
+        "runner": test_fingerprintjs,
+        "verdict": lambda r: "PASSED (flights shown)" if r.get("passed") else "BLOCKED" if r.get("isBlocked") else "NO FLIGHTS",
+        "pass": lambda r: r.get("passed", False),
+    },
+    {
+        "name": "reCAPTCHA v3 (Google)",
+        "url": "https://recaptcha-demo.appspot.com/recaptcha-v3-request-scores.php",
+        "runner": test_recaptcha,
+        "verdict": lambda r: f"Score: {r.get('score', 'N/A')}",
+        "pass": lambda r: (r.get("score") or 0) >= 0.7,
     },
 ]
 
-browser = launch(headless=True)
-page = browser.new_page()
 
-print("=" * 60)
-print("CloakBrowser Stealth Test Suite")
-print("=" * 60)
+def main():
+    print("=" * 60)
+    print("CloakBrowser Stealth Test Suite")
+    print("=" * 60)
+    print(f"Mode: {'headed' if HEADED else 'headless'}")
+    print(f"Screenshots: {'on' if SCREENSHOTS else 'off'}")
+    print(f"Proxy: {PROXY or 'none'}")
+    print()
 
-for test in TESTS:
-    print(f"\n--- {test['name']} ---")
-    print(f"URL: {test['url']}")
-    try:
-        page.goto(test["url"], wait_until="networkidle", timeout=30000)
-        page.wait_for_timeout(3000)
+    browser = launch(headless=not HEADED, proxy=PROXY)
+    page = browser.new_page()
 
-        # Screenshot each test
-        filename = f"stealth_test_{test['name'].replace('.', '_').replace(' ', '_')}.png"
-        page.screenshot(path=filename)
-        print(f"Screenshot: {filename}")
-        print(f"Title: {page.title()}")
-    except Exception as e:
-        print(f"Error: {e}")
+    results_summary = []
 
-browser.close()
+    for test in TESTS:
+        name = test["name"]
+        print(f"--- {name} ---")
+        print(f"URL: {test['url']}")
 
-print("\n" + "=" * 60)
-print("Tests complete. Check screenshots for results.")
-print("=" * 60)
+        try:
+            result = test["runner"](page)
+            passed = test["pass"](result)
+            verdict = test["verdict"](result)
+            status = "PASS" if passed else "FAIL"
+            results_summary.append((name, status, verdict))
+
+            print(f"Result: [{status}] {verdict}")
+
+            if SCREENSHOTS:
+                filename = f"stealth_test_{name.replace('.', '_').replace(' ', '_').replace('/', '_')}.png"
+                page.screenshot(path=filename)
+                print(f"Screenshot: {filename}")
+
+        except Exception as e:
+            results_summary.append((name, "ERROR", str(e)))
+            print(f"Error: {e}")
+
+        print()
+
+    browser.close()
+
+    # Summary table
+    print("=" * 60)
+    print("RESULTS SUMMARY")
+    print("=" * 60)
+    for name, status, verdict in results_summary:
+        icon = {"PASS": "+", "FAIL": "!", "ERROR": "x"}[status]
+        print(f"  [{icon}] {name}: {verdict}")
+
+    passed_count = sum(1 for _, s, _ in results_summary if s == "PASS")
+    total = len(results_summary)
+    print(f"\n  {passed_count}/{total} tests passed")
+    print("=" * 60)
+
+    return 0 if passed_count == total else 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())

js/README.md

@@ -0,0 +1,219 @@
+<p align="center">
+<img src="https://i.imgur.com/cqkp6fG.png" width="500" alt="CloakBrowser">
+</p>
+
+# CloakBrowser
+
+[![npm](https://img.shields.io/npm/v/cloakbrowser)](https://www.npmjs.com/package/cloakbrowser)
+[![License](https://img.shields.io/github/license/CloakHQ/CloakBrowser)](https://github.com/CloakHQ/CloakBrowser/blob/main/LICENSE)
+
+**Stealth Chromium that passes every bot detection test.**
+
+Drop-in Playwright/Puppeteer replacement. Same API — just swap the import. Scores **0.9 on reCAPTCHA v3**, passes **Cloudflare Turnstile**, and clears **30/30** stealth detection tests.
+
+- 🔒 **25 source-level C++ patches** — not JS injection, not config flags
+- 🎯 **0.9 reCAPTCHA v3 score** — human-level, server-verified
+- ☁️ **Passes Cloudflare Turnstile**, FingerprintJS, BrowserScan — 30/30 tests
+- 🔄 **Drop-in replacement** — works with both Playwright and Puppeteer
+- 📦 **`npm install cloakbrowser`** — binary auto-downloads, zero config
+
+## Install
+
+```bash
+# With Playwright
+npm install cloakbrowser playwright-core
+
+# With Puppeteer
+npm install cloakbrowser puppeteer-core
+```
+
+On first launch, the stealth Chromium binary auto-downloads (~200MB, cached at `~/.cloakbrowser/`).
+
+## Usage
+
+### Playwright (default)
+
+```javascript
+import { launch } from 'cloakbrowser';
+
+const browser = await launch();
+const page = await browser.newPage();
+await page.goto('https://protected-site.com');
+console.log(await page.title());
+await browser.close();
+```
+
+### Puppeteer
+
+> **Note:** Playwright is recommended for sites with reCAPTCHA Enterprise. Puppeteer's CDP protocol leaks automation signals that reCAPTCHA Enterprise can detect. This is a known Puppeteer limitation, not specific to CloakBrowser.
+
+```javascript
+import { launch } from 'cloakbrowser/puppeteer';
+
+const browser = await launch();
+const page = await browser.newPage();
+await page.goto('https://protected-site.com');
+console.log(await page.title());
+await browser.close();
+```
+
+### Options
+
+```javascript
+import { launch, launchContext } from 'cloakbrowser';
+
+// With proxy
+const browser = await launch({
+  proxy: 'http://user:pass@proxy:8080',
+});
+
+// Headed mode (visible browser window)
+const browser = await launch({ headless: false });
+
+// Extra Chrome args
+const browser = await launch({
+  args: ['--window-size=1920,1080'],
+});
+
+// With timezone and locale (sets --fingerprint-timezone and --lang binary flags)
+const browser = await launch({
+  timezone: 'America/New_York',
+  locale: 'en-US',
+});
+
+// Auto-detect timezone/locale from proxy IP (requires: npm install mmdb-lib)
+const browser = await launch({
+  proxy: 'http://proxy:8080',
+  geoip: true,
+});
+
+// Browser + context in one call (timezone/locale set both binary flags AND context)
+const context = await launchContext({
+  userAgent: 'Custom UA',
+  viewport: { width: 1920, height: 1080 },
+  locale: 'en-US',
+  timezoneId: 'America/New_York',
+});
+```
+
+### Auto Timezone/Locale from Proxy IP
+
+When using a proxy, antibot systems check that your browser's timezone and locale match the proxy's location. Install `mmdb-lib` to enable auto-detection from an offline GeoIP database (~70 MB, downloaded on first use):
+
+```bash
+npm install mmdb-lib
+```
+
+```javascript
+// Auto-detect — timezone and locale set from proxy's IP geolocation
+const browser = await launch({ proxy: 'http://proxy:8080', geoip: true });
+
+// Works with launchContext too
+const context = await launchContext({ proxy: 'http://proxy:8080', geoip: true });
+
+// Explicit values always win over auto-detection
+const browser = await launch({ proxy: 'http://proxy:8080', geoip: true, timezone: 'Europe/London' });
+```
+
+> **Note:** For rotating residential proxies, the DNS-resolved IP may differ from the exit IP. Pass explicit `timezone`/`locale` in those cases.
+
+### Utilities
+
+```javascript
+import { ensureBinary, clearCache, binaryInfo, checkForUpdate } from 'cloakbrowser';
+
+// Pre-download binary (e.g., during Docker build)
+await ensureBinary();
+
+// Check installation
+console.log(binaryInfo());
+
+// Force re-download
+clearCache();
+
+// Manually check for newer Chromium version
+const newVersion = await checkForUpdate();
+if (newVersion) console.log(`Updated to ${newVersion}`);
+```
+
+## Test Results
+
+| Detection Service | Stock Browser | CloakBrowser |
+|---|---|---|
+| **reCAPTCHA v3** | 0.1 (bot) | **0.9** (human) |
+| **Cloudflare Turnstile** | FAIL | **PASS** |
+| **FingerprintJS** | DETECTED | **PASS** |
+| **BrowserScan** | DETECTED | **NORMAL** (4/4) |
+| **bot.incolumitas.com** | 13 fails | **1 fail** |
+| `navigator.webdriver` | `true` | **`false`** |
+
+## Configuration
+
+| Env Variable | Default | Description |
+|---|---|---|
+| `CLOAKBROWSER_BINARY_PATH` | — | Skip download, use a local Chromium binary |
+| `CLOAKBROWSER_CACHE_DIR` | `~/.cloakbrowser` | Binary cache directory |
+| `CLOAKBROWSER_DOWNLOAD_URL` | `cloakbrowser.dev` | Custom download URL |
+| `CLOAKBROWSER_AUTO_UPDATE` | `true` | Set to `false` to disable background update checks |
+| `CLOAKBROWSER_SKIP_CHECKSUM` | `false` | Set to `true` to skip SHA-256 verification after download |
+
+## Migrate From Playwright
+
+```diff
+- import { chromium } from 'playwright';
+- const browser = await chromium.launch();
++ import { launch } from 'cloakbrowser';
++ const browser = await launch();
+
+const page = await browser.newPage();
+// ... rest of your code works unchanged
+```
+
+## Platforms
+
+| Platform | Status |
+|---|---|
+| Linux x86_64 | ✅ Available |
+| macOS arm64 (Apple Silicon) | ✅ Available |
+| macOS x86_64 (Intel) | ✅ Available |
+| Windows x86_64 | ✅ Available |
+
+## Requirements
+
+- Node.js >= 18
+- One of: `playwright-core` >= 1.40 or `puppeteer-core` >= 21
+
+## Troubleshooting
+
+**reCAPTCHA v3 scores are low (0.1–0.3)**
+
+Avoid `page.waitForTimeout()` — it sends CDP protocol commands that reCAPTCHA detects. Use native sleep instead:
+
+```javascript
+// Bad — sends CDP commands, reCAPTCHA detects this
+await page.waitForTimeout(3000);
+
+// Good — invisible to the browser
+await new Promise(r => setTimeout(r, 3000));
+```
+
+Other tips for maximizing reCAPTCHA scores:
+- **Use Playwright, not Puppeteer** — Puppeteer sends more CDP protocol traffic that reCAPTCHA detects ([details](#puppeteer))
+- **Use residential proxies** — datacenter IPs are flagged by IP reputation, not browser fingerprint
+- **Spend 15+ seconds on the page** before triggering reCAPTCHA — short visits score lower
+- **Space out requests** — back-to-back `grecaptcha.execute()` calls from the same session get penalized. Wait 30+ seconds between pages with reCAPTCHA
+- **Use a fixed fingerprint seed** (`--fingerprint=12345`) for consistent device identity across sessions
+- **Minimize `page.evaluate()` calls** before the reCAPTCHA check fires — each one sends CDP traffic
+
+## Links
+
+- 🌐 [Website](https://cloakbrowser.dev)
+- 🐛 [Bug reports & feature requests](https://github.com/CloakHQ/CloakBrowser/issues)
+- 📦 [PyPI (Python package)](https://pypi.org/project/cloakbrowser/)
+- 📖 [Full documentation](https://github.com/CloakHQ/CloakBrowser#readme)
+- 📧 Contact: cloakhq@pm.me
+
+## License
+
+- **Wrapper code** (this repository) — MIT. See [LICENSE](https://github.com/CloakHQ/CloakBrowser/blob/main/LICENSE).
+- **CloakBrowser binary** (compiled Chromium) — free to use, no redistribution. See [BINARY-LICENSE.md](https://github.com/CloakHQ/CloakBrowser/blob/main/BINARY-LICENSE.md).

js/examples/basic-playwright.ts

@@ -0,0 +1,18 @@
+/**
+ * Basic CloakBrowser example using Playwright API.
+ *
+ * Usage:
+ *   CLOAKBROWSER_BINARY_PATH=/path/to/chrome npx tsx examples/basic-playwright.ts
+ */
+
+import { launch } from "../src/index.js";
+
+const browser = await launch({ headless: true });
+const page = await browser.newPage();
+
+await page.goto("https://example.com");
+console.log(`Title: ${await page.title()}`);
+console.log(`URL: ${page.url()}`);
+
+await browser.close();
+console.log("Done.");

js/examples/basic-puppeteer.ts

@@ -0,0 +1,18 @@
+/**
+ * Basic CloakBrowser example using Puppeteer API.
+ *
+ * Usage:
+ *   CLOAKBROWSER_BINARY_PATH=/path/to/chrome npx tsx examples/basic-puppeteer.ts
+ */
+
+import { launch } from "../src/puppeteer.js";
+
+const browser = await launch({ headless: true });
+const page = await browser.newPage();
+
+await page.goto("https://example.com");
+console.log(`Title: ${await page.title()}`);
+console.log(`URL: ${page.url()}`);
+
+await browser.close();
+console.log("Done.");

js/examples/stealth-test.ts

@@ -0,0 +1,280 @@
+/**
+ * Full stealth test suite — validates CloakBrowser against live detection services.
+ * Mirrors Python examples/stealth_test.py.
+ *
+ * Usage:
+ *   CLOAKBROWSER_BINARY_PATH=/path/to/chrome npx tsx examples/stealth-test.ts
+ *   CLOAKBROWSER_BINARY_PATH=/path/to/chrome npx tsx examples/stealth-test.ts --proxy http://10.50.96.5:8888
+ */
+
+import { launch } from "../src/index.js";
+
+const PROXY = process.argv.includes("--proxy")
+  ? process.argv[process.argv.indexOf("--proxy") + 1]
+  : undefined;
+
+interface TestResult {
+  name: string;
+  status: "PASS" | "FAIL" | "ERROR";
+  verdict: string;
+}
+
+const results: TestResult[] = [];
+
+console.log("=".repeat(60));
+console.log("CloakBrowser JS — Stealth Test Suite");
+console.log("=".repeat(60));
+console.log(`Proxy: ${PROXY || "none"}\n`);
+
+const browser = await launch({ headless: true, proxy: PROXY });
+const page = await browser.newPage();
+
+// ---------------------------------------------------------------------------
+// Test 1: bot.sannysoft.com
+// ---------------------------------------------------------------------------
+async function testSannysoft() {
+  console.log("--- bot.sannysoft.com ---");
+  await page.goto("https://bot.sannysoft.com", {
+    waitUntil: "networkidle",
+    timeout: 30000,
+  });
+  await page.waitForTimeout(3000);
+
+  const result = await page.evaluate(() => {
+    const rows = document.querySelectorAll("table tr");
+    let passed = 0;
+    let total = 0;
+    const failed: string[] = [];
+    rows.forEach((r) => {
+      const cells = r.querySelectorAll("td");
+      if (cells.length >= 2) {
+        total++;
+        const key = cells[0]!.innerText.trim();
+        const cls = cells[1]!.className || "";
+        if (cls.includes("failed")) {
+          failed.push(key);
+        } else {
+          passed++;
+        }
+      }
+    });
+    return { passed, total, failed };
+  });
+
+  const verdict =
+    result.failed.length === 0
+      ? `${result.passed}/${result.total} — ALL GREEN`
+      : `${result.passed}/${result.total} (FAILED: ${result.failed.join(", ")})`;
+  const status = result.failed.length === 0 ? "PASS" : "FAIL";
+  console.log(`Result: [${status}] ${verdict}\n`);
+  results.push({ name: "bot.sannysoft.com", status, verdict });
+}
+
+// ---------------------------------------------------------------------------
+// Test 2: bot.incolumitas.com
+// ---------------------------------------------------------------------------
+async function testIncolumitas() {
+  console.log("--- bot.incolumitas.com ---");
+  await page.goto("https://bot.incolumitas.com", {
+    waitUntil: "networkidle",
+    timeout: 30000,
+  });
+  await page.waitForTimeout(12000); // needs time for all detection tests
+
+  const result = await page.evaluate(() => {
+    const text = document.body.innerText;
+    const okMatches = text.match(/"(\w+)":\s*"OK"/g) || [];
+    const failMatches = text.match(/"(\w+)":\s*"FAIL"/g) || [];
+    const failedTests = failMatches.map((m) => {
+      const match = m.match(/"(\w+)"/);
+      return match ? match[1] : m;
+    });
+    return {
+      passed: okMatches.length,
+      failed: failMatches.length,
+      failedTests,
+      total: okMatches.length + failMatches.length,
+    };
+  });
+
+  const verdict =
+    result.failed === 0
+      ? `${result.passed}/${result.total} — ALL GREEN`
+      : `${result.passed}/${result.total} (FAILED: ${result.failedTests.join(", ")})`;
+  // WEBDRIVER false positive is expected
+  const status = result.failed <= 1 ? "PASS" : "FAIL";
+  console.log(`Result: [${status}] ${verdict}\n`);
+  results.push({ name: "bot.incolumitas.com", status, verdict });
+}
+
+// ---------------------------------------------------------------------------
+// Test 3: BrowserScan
+// ---------------------------------------------------------------------------
+async function testBrowserScan() {
+  console.log("--- BrowserScan ---");
+  await page.goto("https://www.browserscan.net/bot-detection", {
+    waitUntil: "networkidle",
+    timeout: 30000,
+  });
+  await page.waitForTimeout(5000);
+
+  const result = await page.evaluate(() => {
+    const text = document.body.innerText;
+    const normalMatches = text.match(/Normal/g);
+    const abnormalMatches = text.match(/Abnormal/g);
+    return {
+      normal: normalMatches ? normalMatches.length : 0,
+      abnormal: abnormalMatches ? abnormalMatches.length : 0,
+    };
+  });
+
+  const verdict = `Normal: ${result.normal}, Abnormal: ${result.abnormal}`;
+  const status = result.abnormal === 0 ? "PASS" : "FAIL";
+  console.log(`Result: [${status}] ${verdict}\n`);
+  results.push({ name: "BrowserScan", status, verdict });
+}
+
+// ---------------------------------------------------------------------------
+// Test 4: deviceandbrowserinfo.com
+// ---------------------------------------------------------------------------
+async function testDeviceAndBrowserInfo() {
+  console.log("--- deviceandbrowserinfo.com ---");
+  await page.goto("https://deviceandbrowserinfo.com/are_you_a_bot", {
+    waitUntil: "domcontentloaded",
+    timeout: 30000,
+  });
+  await page.waitForTimeout(8000);
+
+  const result = await page.evaluate(() => {
+    const text = document.body.innerText;
+    const botMatch = text.match(/"isBot":\s*(true|false)/);
+    const isBot = botMatch ? botMatch[1] === "true" : null;
+    const checks: Record<string, boolean> = {};
+    const patterns = [
+      "isBot",
+      "hasBotUserAgent",
+      "hasWebdriverTrue",
+      "isHeadlessChrome",
+      "isAutomatedWithCDP",
+      "hasSuspiciousWeakSignals",
+      "isPlaywright",
+      "hasInconsistentChromeObject",
+    ];
+    patterns.forEach((p) => {
+      const match = text.match(new RegExp('"' + p + '":\\s*(true|false)'));
+      if (match) checks[p] = match[1] === "true";
+    });
+    return { isBot, checks };
+  });
+
+  const trueFlags = Object.entries(result.checks)
+    .filter(([, v]) => v)
+    .map(([k]) => k);
+  const verdict =
+    `isBot: ${result.isBot}` +
+    (trueFlags.length > 0 ? ` (flagged: ${trueFlags.join(", ")})` : " — all clear");
+  const status = !result.isBot ? "PASS" : "FAIL";
+  console.log(`Result: [${status}] ${verdict}\n`);
+  results.push({ name: "deviceandbrowserinfo.com", status, verdict });
+}
+
+// ---------------------------------------------------------------------------
+// Test 5: FingerprintJS
+// ---------------------------------------------------------------------------
+async function testFingerprintJS() {
+  console.log("--- FingerprintJS ---");
+  await page.goto("https://demo.fingerprint.com/web-scraping", {
+    waitUntil: "networkidle",
+    timeout: 30000,
+  });
+  await page.waitForTimeout(5000);
+
+  try {
+    await page.click("button:has-text('Search')", { timeout: 5000 });
+    await page.waitForTimeout(5000);
+  } catch {
+    // Search button may not be present
+  }
+
+  const result = await page.evaluate(() => {
+    const text = document.body.innerText;
+    const hasFlights =
+      text.includes("Price per adult") || text.includes("$");
+    const isBlocked =
+      text.includes("request was blocked") ||
+      text.includes("bot visit detected");
+    return { passed: hasFlights && !isBlocked, isBlocked, hasFlights };
+  });
+
+  const verdict = result.passed
+    ? "PASSED (flights shown)"
+    : result.isBlocked
+      ? "BLOCKED"
+      : "NO FLIGHTS";
+  const status = result.passed ? "PASS" : "FAIL";
+  console.log(`Result: [${status}] ${verdict}\n`);
+  results.push({ name: "FingerprintJS", status, verdict });
+}
+
+// ---------------------------------------------------------------------------
+// Test 6: reCAPTCHA v3
+// ---------------------------------------------------------------------------
+async function testRecaptcha() {
+  console.log("--- reCAPTCHA v3 (Google) ---");
+  await page.goto(
+    "https://recaptcha-demo.appspot.com/recaptcha-v3-request-scores.php",
+    { waitUntil: "networkidle", timeout: 30000 }
+  );
+  await page.waitForTimeout(8000);
+
+  const result = await page.evaluate(() => {
+    const text = document.body.innerText;
+    const scoreMatch = text.match(/"score":\s*(\d+\.\d+)/);
+    return {
+      score: scoreMatch ? parseFloat(scoreMatch[1]) : null,
+    };
+  });
+
+  const verdict = `Score: ${result.score ?? "N/A"}`;
+  const status = (result.score ?? 0) >= 0.7 ? "PASS" : "FAIL";
+  console.log(`Result: [${status}] ${verdict}\n`);
+  results.push({ name: "reCAPTCHA v3", status, verdict });
+}
+
+// ---------------------------------------------------------------------------
+// Run all tests
+// ---------------------------------------------------------------------------
+const tests = [
+  testSannysoft,
+  testIncolumitas,
+  testBrowserScan,
+  testDeviceAndBrowserInfo,
+  testFingerprintJS,
+  testRecaptcha,
+];
+
+for (const test of tests) {
+  try {
+    await test();
+  } catch (err) {
+    const name = test.name.replace("test", "");
+    console.log(`Error: ${err}\n`);
+    results.push({ name, status: "ERROR", verdict: String(err) });
+  }
+}
+
+await browser.close();
+
+// Summary
+console.log("=".repeat(60));
+console.log("RESULTS SUMMARY");
+console.log("=".repeat(60));
+for (const r of results) {
+  const icon = { PASS: "+", FAIL: "!", ERROR: "x" }[r.status];
+  console.log(`  [${icon}] ${r.name}: ${r.verdict}`);
+}
+const passedCount = results.filter((r) => r.status === "PASS").length;
+console.log(`\n  ${passedCount}/${results.length} tests passed`);
+console.log("=".repeat(60));
+
+process.exit(passedCount === results.length ? 0 : 1);

js/package.json

@@ -0,0 +1,85 @@
+{
+  "name": "cloakbrowser",
+  "version": "0.3.3",
+  "description": "Stealth Chromium that passes every bot detection test. Drop-in Playwright/Puppeteer replacement with source-level fingerprint patches.",
+  "type": "module",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    },
+    "./puppeteer": {
+      "types": "./dist/puppeteer.d.ts",
+      "import": "./dist/puppeteer.js"
+    }
+  },
+  "files": [
+    "dist"
+  ],
+  "keywords": [
+    "stealth",
+    "browser",
+    "chromium",
+    "playwright",
+    "puppeteer",
+    "scraping",
+    "web-scraping",
+    "anti-detect",
+    "antidetect",
+    "undetected",
+    "bot-detection",
+    "fingerprint",
+    "recaptcha",
+    "cloudflare",
+    "turnstile",
+    "datadome",
+    "captcha",
+    "headless",
+    "automation",
+    "ai-agent"
+  ],
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/CloakHQ/cloakbrowser",
+    "directory": "js"
+  },
+  "homepage": "https://github.com/CloakHQ/cloakbrowser#javascript--nodejs",
+  "engines": {
+    "node": ">=18.0.0"
+  },
+  "peerDependencies": {
+    "mmdb-lib": ">=2.0.0",
+    "playwright-core": ">=1.40.0",
+    "puppeteer-core": ">=21.0.0"
+  },
+  "peerDependenciesMeta": {
+    "playwright-core": {
+      "optional": true
+    },
+    "puppeteer-core": {
+      "optional": true
+    },
+    "mmdb-lib": {
+      "optional": true
+    }
+  },
+  "dependencies": {
+    "tar": "^7.0.0"
+  },
+  "devDependencies": {
+    "@types/node": "^20.10.0",
+    "mmdb-lib": "^3.0.2",
+    "playwright-core": "^1.40.0",
+    "puppeteer-core": "^21.0.0",
+    "typescript": "^5.3.0",
+    "vitest": "^1.0.0"
+  },
+  "scripts": {
+    "build": "tsc",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run"
+  }
+}

js/src/config.ts

@@ -0,0 +1,225 @@
+/**
+ * Stealth configuration and platform detection for cloakbrowser.
+ * Mirrors Python cloakbrowser/config.py.
+ */
+
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+// Read wrapper version from package.json (single source of truth)
+let WRAPPER_VERSION = "0.0.0";
+try {
+  const _configDir = path.dirname(fileURLToPath(import.meta.url));
+  const _pkgPath = path.resolve(_configDir, "..", "package.json");
+  const _pkg = JSON.parse(fs.readFileSync(_pkgPath, "utf-8")) as { version: string };
+  WRAPPER_VERSION = _pkg.version;
+} catch {
+  // Fallback — package.json not found (bundled or unusual layout).
+  // Wrapper update check will compare against 0.0.0 and always suggest updating.
+}
+export { WRAPPER_VERSION };
+
+// ---------------------------------------------------------------------------
+// Chromium version shipped with this release.
+// Different platforms may ship different versions during transition periods.
+// CHROMIUM_VERSION is the latest across all platforms (for display/reference).
+// Use getChromiumVersion() for the current platform's actual version.
+// ---------------------------------------------------------------------------
+export const CHROMIUM_VERSION = "145.0.7632.109";
+
+export const PLATFORM_CHROMIUM_VERSIONS: Record<string, string> = {
+  "linux-x64": "145.0.7632.109",
+  "darwin-arm64": "145.0.7632.109",
+  "darwin-x64": "145.0.7632.109",
+  "windows-x64": "145.0.7632.109",
+};
+
+// ---------------------------------------------------------------------------
+// Platform detection
+// ---------------------------------------------------------------------------
+const SUPPORTED_PLATFORMS: Record<string, string> = {
+  "linux-x64": "linux-x64",
+  "linux-arm64": "linux-arm64",
+  "darwin-arm64": "darwin-arm64",
+  "darwin-x64": "darwin-x64",
+  "win32-x64": "windows-x64",
+};
+
+// Platforms with pre-built binaries available for download (derived from version map).
+const AVAILABLE_PLATFORMS = new Set(Object.keys(PLATFORM_CHROMIUM_VERSIONS));
+
+export function getChromiumVersion(): string {
+  const tag = getPlatformTag();
+  return PLATFORM_CHROMIUM_VERSIONS[tag] ?? CHROMIUM_VERSION;
+}
+
+export function getPlatformTag(): string {
+  const platform = process.platform;
+  const arch = process.arch;
+
+  // Map Node.js platform/arch to our tag format
+  let key: string;
+  if (platform === "linux" && arch === "x64") key = "linux-x64";
+  else if (platform === "linux" && arch === "arm64") key = "linux-arm64";
+  else if (platform === "darwin" && arch === "arm64") key = "darwin-arm64";
+  else if (platform === "darwin" && arch === "x64") key = "darwin-x64";
+  else if (platform === "win32" && arch === "x64") key = "win32-x64";
+  else {
+    const supported = Object.values(SUPPORTED_PLATFORMS).join(", ");
+    throw new Error(
+      `Unsupported platform: ${platform} ${arch}. Supported: ${supported}`
+    );
+  }
+
+  return SUPPORTED_PLATFORMS[key]!;
+}
+
+// ---------------------------------------------------------------------------
+// Binary cache paths
+// ---------------------------------------------------------------------------
+export function getCacheDir(): string {
+  const custom = process.env.CLOAKBROWSER_CACHE_DIR;
+  if (custom) return custom;
+  return path.join(os.homedir(), ".cloakbrowser");
+}
+
+export function getBinaryDir(version?: string): string {
+  return path.join(getCacheDir(), `chromium-${version || getChromiumVersion()}`);
+}
+
+export function getBinaryPath(version?: string): string {
+  const binaryDir = getBinaryDir(version);
+  if (process.platform === "darwin") {
+    return path.join(binaryDir, "Chromium.app", "Contents", "MacOS", "Chromium");
+  }
+  if (process.platform === "win32") {
+    return path.join(binaryDir, "chrome.exe");
+  }
+  return path.join(binaryDir, "chrome");
+}
+
+export function checkPlatformAvailable(): void {
+  if (getLocalBinaryOverride()) return;
+
+  const tag = getPlatformTag(); // throws if unsupported entirely
+  if (!AVAILABLE_PLATFORMS.has(tag)) {
+    const available = [...AVAILABLE_PLATFORMS].sort().join(", ");
+    throw new Error(
+      `CloakBrowser — Pre-built binaries are currently only available for: ${available}.\n\n` +
+        `To use CloakBrowser now, set CLOAKBROWSER_BINARY_PATH to a local Chromium binary.`
+    );
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Download URL
+// ---------------------------------------------------------------------------
+export const DOWNLOAD_BASE_URL =
+  process.env.CLOAKBROWSER_DOWNLOAD_URL ||
+  "https://cloakbrowser.dev";
+
+export const GITHUB_API_URL =
+  "https://api.github.com/repos/CloakHQ/cloakbrowser/releases";
+
+export const GITHUB_DOWNLOAD_BASE_URL =
+  "https://github.com/CloakHQ/cloakbrowser/releases/download";
+
+export function getDownloadUrl(version?: string): string {
+  const v = version || getChromiumVersion();
+  const tag = getPlatformTag();
+  return `${DOWNLOAD_BASE_URL}/chromium-v${v}/cloakbrowser-${tag}.tar.gz`;
+}
+
+export function getFallbackDownloadUrl(version?: string): string {
+  const v = version || getChromiumVersion();
+  const tag = getPlatformTag();
+  return `${GITHUB_DOWNLOAD_BASE_URL}/chromium-v${v}/cloakbrowser-${tag}.tar.gz`;
+}
+
+export function getEffectiveVersion(): string {
+  const base = getChromiumVersion();
+  const cacheDir = getCacheDir();
+  // Try platform-scoped marker first, fall back to legacy marker for upgrades from <0.3.0
+  for (const name of [`latest_version_${getPlatformTag()}`, "latest_version"]) {
+    const marker = path.join(cacheDir, name);
+    try {
+      if (fs.existsSync(marker)) {
+        const version = fs.readFileSync(marker, "utf-8").trim();
+        if (version && versionNewer(version, base)) {
+          const binary = getBinaryPath(version);
+          if (fs.existsSync(binary)) {
+            return version;
+          }
+        }
+      }
+    } catch {
+      // Marker unreadable — try next
+    }
+  }
+  return base;
+}
+
+export function parseVersion(v: string): number[] {
+  return v.split(".").map(Number);
+}
+
+export function versionNewer(a: string, b: string): boolean {
+  const va = parseVersion(a);
+  const vb = parseVersion(b);
+  for (let i = 0; i < Math.max(va.length, vb.length); i++) {
+    if ((va[i] ?? 0) > (vb[i] ?? 0)) return true;
+    if ((va[i] ?? 0) < (vb[i] ?? 0)) return false;
+  }
+  return false;
+}
+
+// ---------------------------------------------------------------------------
+// Local binary override
+// ---------------------------------------------------------------------------
+export function getLocalBinaryOverride(): string | undefined {
+  return process.env.CLOAKBROWSER_BINARY_PATH || undefined;
+}
+
+// ---------------------------------------------------------------------------
+// Default stealth arguments
+// ---------------------------------------------------------------------------
+// Default viewport — realistic maximized Chrome on 1080p Windows
+// screen=1920x1080, availHeight=1032 (minus 48px taskbar, binary default),
+// innerHeight=947 (minus ~85px Chrome UI: tabs + address bar + bookmarks)
+export const DEFAULT_VIEWPORT = { width: 1920, height: 947 };
+
+export function getDefaultStealthArgs(): string[] {
+  const seed = Math.floor(Math.random() * 90000) + 10000; // 10000-99999
+  const isMac = process.platform === "darwin";
+
+  const base = [
+    "--no-sandbox",
+    "--disable-blink-features=AutomationControlled",
+    `--fingerprint=${seed}`,
+  ];
+
+  if (isMac) {
+    // macOS: run as native Mac browser — GPU/UA match natively
+    return [
+      ...base,
+      "--fingerprint-platform=macos",
+      "--fingerprint-gpu-vendor=Google Inc. (Apple)",
+      "--fingerprint-gpu-renderer=ANGLE (Apple, ANGLE Metal Renderer: Apple M3, Unspecified Version)",
+    ];
+  }
+
+  // Linux/Windows: Windows fingerprint profile
+  return [
+    ...base,
+    "--fingerprint-platform=windows",
+    "--fingerprint-hardware-concurrency=8",
+    "--fingerprint-device-memory=8",
+    "--fingerprint-gpu-vendor=NVIDIA Corporation",
+    "--fingerprint-gpu-renderer=NVIDIA GeForce RTX 3070",
+    "--fingerprint-screen-width=1920",
+    "--fingerprint-screen-height=1080",
+    "--window-size=1920,1080",
+  ];
+}

js/src/download.ts

@@ -0,0 +1,556 @@
+/**
+ * Binary download and cache management for cloakbrowser.
+ * Downloads the patched Chromium binary on first use, caches it locally.
+ * Mirrors Python cloakbrowser/download.py.
+ */
+
+import { execFileSync } from "node:child_process";
+import { createHash } from "node:crypto";
+import fs from "node:fs";
+import path from "node:path";
+import { pipeline } from "node:stream/promises";
+import { createWriteStream } from "node:fs";
+import { extract as tarExtract } from "tar";
+
+import type { BinaryInfo } from "./types.js";
+import {
+  DOWNLOAD_BASE_URL,
+  GITHUB_API_URL,
+  GITHUB_DOWNLOAD_BASE_URL,
+  WRAPPER_VERSION,
+  checkPlatformAvailable,
+  getBinaryDir,
+  getBinaryPath,
+  getCacheDir,
+  getChromiumVersion,
+  getDownloadUrl,
+  getEffectiveVersion,
+  getFallbackDownloadUrl,
+  getLocalBinaryOverride,
+  getPlatformTag,
+  versionNewer,
+} from "./config.js";
+
+const DOWNLOAD_TIMEOUT_MS = 600_000; // 10 minutes
+const UPDATE_CHECK_INTERVAL_MS = 3_600_000; // 1 hour
+
+// ---------------------------------------------------------------------------
+// Public API
+// ---------------------------------------------------------------------------
+
+/**
+ * Ensure the stealth Chromium binary is available. Download if needed.
+ * Returns the path to the chrome executable.
+ */
+export async function ensureBinary(): Promise<string> {
+  // Check for local override
+  const localOverride = getLocalBinaryOverride();
+  if (localOverride) {
+    if (!fs.existsSync(localOverride)) {
+      throw new Error(
+        `CLOAKBROWSER_BINARY_PATH set to '${localOverride}' but file does not exist`
+      );
+    }
+    console.log(`[cloakbrowser] Using local binary override: ${localOverride}`);
+    return localOverride;
+  }
+
+  // Fail fast if no binary available for this platform
+  checkPlatformAvailable();
+
+  // Check for auto-updated version first, then fall back to hardcoded
+  const effective = getEffectiveVersion();
+  const binaryPath = getBinaryPath(effective);
+
+  if (fs.existsSync(binaryPath) && isExecutable(binaryPath)) {
+    maybeTriggerUpdateCheck();
+    return binaryPath;
+  }
+
+  // Fall back to platform's hardcoded version if effective version binary doesn't exist
+  const platformVersion = getChromiumVersion();
+  if (effective !== platformVersion) {
+    const fallbackPath = getBinaryPath();
+    if (fs.existsSync(fallbackPath) && isExecutable(fallbackPath)) {
+      maybeTriggerUpdateCheck();
+      return fallbackPath;
+    }
+  }
+
+  // Download platform's hardcoded version
+  console.log(
+    `[cloakbrowser] Stealth Chromium ${platformVersion} not found. Downloading for ${getPlatformTag()}...`
+  );
+  await downloadAndExtract();
+
+  const downloadedPath = getBinaryPath();
+  if (!fs.existsSync(downloadedPath)) {
+    throw new Error(
+      `Download completed but binary not found at expected path: ${downloadedPath}. ` +
+        `This may indicate a packaging issue. Please report at ` +
+        `https://github.com/CloakHQ/cloakbrowser/issues`
+    );
+  }
+
+  maybeTriggerUpdateCheck();
+  return downloadedPath;
+}
+
+/** Remove all cached binaries. Forces re-download on next launch. */
+export function clearCache(): void {
+  const cacheDir = getCacheDir();
+  if (fs.existsSync(cacheDir)) {
+    fs.rmSync(cacheDir, { recursive: true, force: true });
+    console.log(`[cloakbrowser] Cache cleared: ${cacheDir}`);
+  }
+}
+
+/** Return info about the current binary installation. */
+export function binaryInfo(): BinaryInfo {
+  const effective = getEffectiveVersion();
+  const binaryPath = getBinaryPath(effective);
+  return {
+    version: effective,
+    platform: getPlatformTag(),
+    binaryPath,
+    installed: fs.existsSync(binaryPath),
+    cacheDir: getBinaryDir(effective),
+    downloadUrl: getDownloadUrl(effective),
+  };
+}
+
+/** Manually check for a newer Chromium version. Returns new version or null. */
+export async function checkForUpdate(): Promise<string | null> {
+  const latest = await getLatestChromiumVersion();
+  if (!latest || !versionNewer(latest, getChromiumVersion())) return null;
+
+  const binaryDir = getBinaryDir(latest);
+  if (fs.existsSync(binaryDir)) {
+    writeVersionMarker(latest);
+    return latest;
+  }
+
+  console.log(`[cloakbrowser] Downloading Chromium ${latest}...`);
+  await downloadAndExtract(latest);
+  writeVersionMarker(latest);
+  return latest;
+}
+
+// ---------------------------------------------------------------------------
+// Internal helpers
+// ---------------------------------------------------------------------------
+
+async function downloadAndExtract(version?: string): Promise<void> {
+  const primaryUrl = getDownloadUrl(version);
+  const fallbackUrl = getFallbackDownloadUrl(version);
+  const binaryDir = getBinaryDir(version);
+  const binaryPath = getBinaryPath(version);
+
+  // Create cache dir
+  fs.mkdirSync(path.dirname(binaryDir), { recursive: true });
+
+  // Download to temp file (atomic — no partial downloads in cache)
+  const tmpPath = path.join(
+    path.dirname(binaryDir),
+    `_download_${Date.now()}.tar.gz`
+  );
+
+  try {
+    // Try primary server, fall back to GitHub Releases (skip fallback if custom URL)
+    try {
+      await downloadFile(primaryUrl, tmpPath);
+    } catch (primaryErr) {
+      if (process.env.CLOAKBROWSER_DOWNLOAD_URL) {
+        throw primaryErr;
+      }
+      console.warn(
+        `[cloakbrowser] Primary download failed (${primaryErr instanceof Error ? primaryErr.message : primaryErr}), trying GitHub Releases...`
+      );
+      await downloadFile(fallbackUrl, tmpPath);
+    }
+
+    // Verify checksum before extraction
+    if (process.env.CLOAKBROWSER_SKIP_CHECKSUM?.toLowerCase() !== "true") {
+      await verifyDownloadChecksum(tmpPath, version);
+    }
+
+    await extractArchive(tmpPath, binaryDir, binaryPath);
+    console.log(
+      `[cloakbrowser] Visit https://cloakbrowser.dev for docs and release notifications.`
+    );
+    console.log(
+      `[cloakbrowser] Issues? https://github.com/CloakHQ/CloakBrowser/issues`
+    );
+    console.log(
+      `[cloakbrowser] Star us if CloakBrowser helps: https://github.com/CloakHQ/CloakBrowser`
+    );
+  } finally {
+    // Clean up temp file
+    if (fs.existsSync(tmpPath)) {
+      fs.unlinkSync(tmpPath);
+    }
+  }
+}
+
+async function verifyDownloadChecksum(filePath: string, version?: string): Promise<void> {
+  const checksums = await fetchChecksums(version);
+  const tarballName = `cloakbrowser-${getPlatformTag()}.tar.gz`;
+
+  if (!checksums) {
+    console.warn("[cloakbrowser] SHA256SUMS not available for this release — skipping checksum verification");
+    return;
+  }
+
+  const expected = checksums.get(tarballName);
+  if (!expected) {
+    console.warn(`[cloakbrowser] SHA256SUMS found but no entry for ${tarballName} — skipping verification`);
+    return;
+  }
+
+  await verifyChecksum(filePath, expected);
+}
+
+async function fetchChecksums(version?: string): Promise<Map<string, string> | null> {
+  const v = version || getChromiumVersion();
+  const hasCustomUrl = !!process.env.CLOAKBROWSER_DOWNLOAD_URL;
+
+  // Respect custom URL contract — no GitHub fallback when custom URL is set
+  const urls = [`${DOWNLOAD_BASE_URL}/chromium-v${v}/SHA256SUMS`];
+  if (!hasCustomUrl) {
+    urls.push(`${GITHUB_DOWNLOAD_BASE_URL}/chromium-v${v}/SHA256SUMS`);
+  }
+
+  for (const url of urls) {
+    try {
+      const resp = await fetch(url, {
+        redirect: "follow",
+        signal: AbortSignal.timeout(10_000),
+      });
+      if (!resp.ok) continue;
+      return parseChecksums(await resp.text());
+    } catch {
+      continue;
+    }
+  }
+  return null;
+}
+
+/** @internal Exported for testing only. */
+export function parseChecksums(text: string): Map<string, string> {
+  const result = new Map<string, string>();
+  for (const line of text.trim().split("\n")) {
+    const trimmed = line.trim();
+    if (!trimmed) continue;
+    const match = trimmed.match(/^([a-f0-9]{64})\s+\*?(.+)$/i);
+    if (match) {
+      result.set(match[2]!, match[1]!.toLowerCase());
+    }
+  }
+  return result;
+}
+
+async function verifyChecksum(filePath: string, expectedHash: string): Promise<void> {
+  const hash = createHash("sha256");
+  const stream = fs.createReadStream(filePath);
+  for await (const chunk of stream) {
+    hash.update(chunk);
+  }
+  const actual = hash.digest("hex").toLowerCase();
+  if (actual !== expectedHash) {
+    throw new Error(
+      `Checksum verification failed!\n` +
+      `  Expected: ${expectedHash}\n` +
+      `  Got:      ${actual}\n` +
+      `  File may be corrupted or tampered with. ` +
+      `Please retry or report at https://github.com/CloakHQ/cloakbrowser/issues`
+    );
+  }
+  console.log("[cloakbrowser] Checksum verified: SHA-256 OK");
+}
+
+async function downloadFile(url: string, dest: string): Promise<void> {
+  console.log(`[cloakbrowser] Downloading from ${url}`);
+
+  const controller = new AbortController();
+  const timeout = setTimeout(() => controller.abort(), DOWNLOAD_TIMEOUT_MS);
+
+  try {
+    const response = await fetch(url, {
+      signal: controller.signal,
+      redirect: "follow",
+    });
+
+    if (!response.ok) {
+      throw new Error(`Download failed: HTTP ${response.status} ${response.statusText}`);
+    }
+
+    if (!response.body) {
+      throw new Error("Download failed: empty response body");
+    }
+
+    const total = Number(response.headers.get("content-length") || 0);
+    let downloaded = 0;
+    let lastLoggedPct = -1;
+
+    const fileStream = createWriteStream(dest);
+    const reader = response.body.getReader();
+
+    // Stream chunks to file with progress logging
+    while (true) {
+      const { done, value } = await reader.read();
+      if (done) break;
+
+      fileStream.write(value);
+      downloaded += value.length;
+
+      if (total > 0) {
+        const pct = Math.floor((downloaded / total) * 100);
+        if (pct >= lastLoggedPct + 10) {
+          lastLoggedPct = pct;
+          const dlMB = Math.floor(downloaded / (1024 * 1024));
+          const totalMB = Math.floor(total / (1024 * 1024));
+          console.log(
+            `[cloakbrowser] Download progress: ${pct}% (${dlMB}/${totalMB} MB)`
+          );
+        }
+      }
+    }
+
+    // Wait for file stream to finish
+    await new Promise<void>((resolve, reject) => {
+      fileStream.end(() => resolve());
+      fileStream.on("error", reject);
+    });
+
+    const sizeMB = Math.floor(fs.statSync(dest).size / (1024 * 1024));
+    console.log(`[cloakbrowser] Download complete: ${sizeMB} MB`);
+  } finally {
+    clearTimeout(timeout);
+  }
+}
+
+async function extractArchive(
+  archivePath: string,
+  destDir: string,
+  binaryPath?: string
+): Promise<void> {
+  console.log(`[cloakbrowser] Extracting to ${destDir}`);
+
+  // Clean existing dir if partial download existed
+  if (fs.existsSync(destDir)) {
+    fs.rmSync(destDir, { recursive: true, force: true });
+  }
+  fs.mkdirSync(destDir, { recursive: true });
+
+  // Extract with tar — the 'tar' package handles symlink/traversal safety
+  await tarExtract({
+    file: archivePath,
+    cwd: destDir,
+    // Security: strip leading path components and reject absolute paths
+    strip: 0,
+    filter: (entryPath: string) => {
+      // Reject absolute paths and path traversal
+      if (path.isAbsolute(entryPath) || entryPath.includes("..")) {
+        console.warn(
+          `[cloakbrowser] Skipping suspicious archive entry: ${entryPath}`
+        );
+        return false;
+      }
+      return true;
+    },
+  });
+
+  // Flatten single subdirectory if needed
+  flattenSingleSubdir(destDir);
+
+  // Make binary executable (skip on Windows — no-op / AV lock risk)
+  const bp = binaryPath || getBinaryPath();
+  if (process.platform !== "win32" && fs.existsSync(bp)) {
+    fs.chmodSync(bp, 0o755);
+  }
+
+  // macOS: remove quarantine/provenance xattrs to prevent Gatekeeper prompts
+  if (process.platform === "darwin") {
+    removeQuarantine(destDir);
+  }
+
+  if (fs.existsSync(bp)) {
+    console.log(`[cloakbrowser] Binary ready: ${bp}`);
+  }
+}
+
+/**
+ * If extraction created a single subdirectory, move its contents up.
+ * Many tarballs wrap files in a top-level directory.
+ */
+function flattenSingleSubdir(destDir: string): void {
+  const entries = fs.readdirSync(destDir);
+  if (entries.length === 1) {
+    const subdir = path.join(destDir, entries[0]!);
+    // Never flatten .app bundles — macOS needs the bundle structure
+    if (entries[0]!.endsWith(".app")) return;
+    if (fs.statSync(subdir).isDirectory()) {
+      const children = fs.readdirSync(subdir);
+      for (const child of children) {
+        fs.renameSync(
+          path.join(subdir, child),
+          path.join(destDir, child)
+        );
+      }
+      fs.rmdirSync(subdir);
+    }
+  }
+}
+
+/** Remove macOS quarantine/provenance xattrs so Gatekeeper doesn't block the binary. */
+function removeQuarantine(dirPath: string): void {
+  try {
+    execFileSync("xattr", ["-cr", dirPath], { timeout: 30_000 });
+  } catch {
+    // Non-fatal — user can manually run: xattr -cr ~/.cloakbrowser/
+  }
+}
+
+function isExecutable(filePath: string): boolean {
+  try {
+    fs.accessSync(filePath, fs.constants.X_OK);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Auto-update
+// ---------------------------------------------------------------------------
+
+function shouldCheckForUpdate(): boolean {
+  if (process.env.CLOAKBROWSER_AUTO_UPDATE?.toLowerCase() === "false")
+    return false;
+  if (getLocalBinaryOverride()) return false;
+  if (process.env.CLOAKBROWSER_DOWNLOAD_URL) return false;
+
+  const checkFile = path.join(getCacheDir(), ".last_update_check");
+  try {
+    const lastCheck = Number(fs.readFileSync(checkFile, "utf-8").trim());
+    if (Date.now() - lastCheck < UPDATE_CHECK_INTERVAL_MS) return false;
+  } catch {
+    /* file doesn't exist or unreadable */
+  }
+  return true;
+}
+
+/** @internal Exported for testing only. */
+export async function getLatestChromiumVersion(): Promise<string | null> {
+  try {
+    const resp = await fetch(`${GITHUB_API_URL}?per_page=10`, {
+      signal: AbortSignal.timeout(10_000),
+    });
+    if (!resp.ok) return null;
+    const releases = (await resp.json()) as Array<{
+      tag_name: string;
+      draft: boolean;
+      assets: Array<{ name: string }>;
+    }>;
+    const platformTarball = `cloakbrowser-${getPlatformTag()}.tar.gz`;
+    for (const release of releases) {
+      if (release.tag_name.startsWith("chromium-v") && !release.draft) {
+        const assetNames = new Set(
+          (release.assets ?? []).map((a) => a.name)
+        );
+        if (assetNames.has(platformTarball)) {
+          return release.tag_name.replace(/^chromium-v/, "");
+        }
+      }
+    }
+    return null;
+  } catch {
+    return null;
+  }
+}
+
+function writeVersionMarker(version: string): void {
+  const cacheDir = getCacheDir();
+  fs.mkdirSync(cacheDir, { recursive: true });
+  const marker = path.join(cacheDir, `latest_version_${getPlatformTag()}`);
+  const tmp = `${marker}.tmp`;
+  fs.writeFileSync(tmp, version);
+  fs.renameSync(tmp, marker);
+}
+
+let wrapperUpdateChecked = false;
+
+/** @internal Exported for testing only. */
+export function resetWrapperUpdateChecked(): void {
+  wrapperUpdateChecked = false;
+}
+
+/** @internal Exported for testing only. */
+export async function checkWrapperUpdate(): Promise<void> {
+  if (wrapperUpdateChecked) return;
+  wrapperUpdateChecked = true;
+  if (process.env.CLOAKBROWSER_AUTO_UPDATE?.toLowerCase() === "false") return;
+  if (process.env.CLOAKBROWSER_DOWNLOAD_URL) return;
+  try {
+    const resp = await fetch("https://registry.npmjs.org/cloakbrowser/latest", {
+      signal: AbortSignal.timeout(5_000),
+    });
+    if (!resp.ok) return;
+    const data = (await resp.json()) as { version: string };
+    if (data.version && versionNewer(data.version, WRAPPER_VERSION)) {
+      console.warn(
+        `[cloakbrowser] Update available: ${WRAPPER_VERSION} → ${data.version}. ` +
+          `Run: npm install cloakbrowser@latest`
+      );
+    }
+  } catch {
+    // Non-fatal — never block binary update check
+  }
+}
+
+async function checkAndDownloadUpdate(): Promise<void> {
+  try {
+    // Record check timestamp first (rate limiting)
+    const cacheDir = getCacheDir();
+    fs.mkdirSync(cacheDir, { recursive: true });
+    fs.writeFileSync(
+      path.join(cacheDir, ".last_update_check"),
+      String(Date.now())
+    );
+
+    const platformVersion = getChromiumVersion();
+    const latest = await getLatestChromiumVersion();
+    if (!latest || !versionNewer(latest, platformVersion)) return;
+
+    // Already downloaded?
+    if (fs.existsSync(getBinaryDir(latest))) {
+      writeVersionMarker(latest);
+      return;
+    }
+
+    console.log(
+      `[cloakbrowser] Newer Chromium available: ${latest} (current: ${platformVersion}). Downloading in background...`
+    );
+    await downloadAndExtract(latest);
+    writeVersionMarker(latest);
+    console.log(
+      `[cloakbrowser] Background update complete: Chromium ${latest} ready. Will use on next launch.`
+    );
+  } catch (err) {
+    // Background update failed — don't disrupt the user
+    if (process.env.DEBUG) {
+      console.error("[cloakbrowser] Background update failed:", err);
+    }
+  }
+}
+
+function maybeTriggerUpdateCheck(): void {
+  // Wrapper update: once per process, not rate-limited
+  if (!wrapperUpdateChecked) {
+    checkWrapperUpdate().catch(() => {});
+  }
+
+  // Binary update: rate-limited to once per hour
+  if (!shouldCheckForUpdate()) return;
+  checkAndDownloadUpdate().catch(() => {});
+}

js/src/geoip.ts

@@ -0,0 +1,262 @@
+/**
+ * GeoIP-based timezone and locale detection from proxy IP.
+ *
+ * Optional feature — requires `mmdb-lib` package:
+ *   npm install mmdb-lib
+ *
+ * Downloads GeoLite2-City.mmdb (~70 MB) on first use,
+ * caches in `~/.cloakbrowser/geoip/`.
+ */
+
+import fs from "node:fs";
+import path from "node:path";
+import { createWriteStream } from "node:fs";
+import dns from "node:dns/promises";
+import net from "node:net";
+import { getCacheDir } from "./config.js";
+
+// P3TERX mirror of MaxMind GeoLite2-City — no license key needed
+const GEOIP_DB_URL =
+  "https://github.com/P3TERX/GeoLite.mmdb/raw/download/GeoLite2-City.mmdb";
+const GEOIP_DB_FILENAME = "GeoLite2-City.mmdb";
+const GEOIP_UPDATE_INTERVAL_MS = 30 * 86_400_000; // 30 days
+
+/** Country ISO code → BCP 47 locale (covers ~90% of proxy traffic). */
+export const COUNTRY_LOCALE_MAP: Record<string, string> = {
+  US: "en-US", GB: "en-GB", AU: "en-AU", CA: "en-CA", NZ: "en-NZ",
+  IE: "en-IE", ZA: "en-ZA", SG: "en-SG",
+  DE: "de-DE", AT: "de-AT", CH: "de-CH",
+  FR: "fr-FR", BE: "fr-BE",
+  ES: "es-ES", MX: "es-MX", AR: "es-AR", CO: "es-CO", CL: "es-CL",
+  BR: "pt-BR", PT: "pt-PT",
+  IT: "it-IT", NL: "nl-NL",
+  JP: "ja-JP", KR: "ko-KR", CN: "zh-CN", TW: "zh-TW", HK: "zh-HK",
+  RU: "ru-RU", UA: "uk-UA", PL: "pl-PL", CZ: "cs-CZ", RO: "ro-RO",
+  IL: "he-IL", TR: "tr-TR", SA: "ar-SA", AE: "ar-AE", EG: "ar-EG",
+  IN: "hi-IN", ID: "id-ID", PH: "en-PH",
+  TH: "th-TH", VN: "vi-VN", MY: "ms-MY",
+  SE: "sv-SE", NO: "nb-NO", DK: "da-DK", FI: "fi-FI",
+  GR: "el-GR", HU: "hu-HU", BG: "bg-BG",
+};
+
+export interface GeoResult {
+  timezone: string | null;
+  locale: string | null;
+}
+
+/**
+ * Resolve timezone and locale from a proxy's IP address.
+ * Returns `{ timezone, locale }` — either may be null on failure.
+ * Never throws.
+ */
+export async function resolveProxyGeo(
+  proxyUrl: string
+): Promise<GeoResult> {
+  let Reader: any;
+  try {
+    const mmdb = await import("mmdb-lib");
+    Reader = mmdb.default?.Reader ?? mmdb.Reader;
+  } catch {
+    throw new Error(
+      "mmdb-lib is required for geoip: true. Install it with:\n  npm install mmdb-lib"
+    );
+  }
+
+  const dbPath = await ensureGeoipDb();
+  if (!dbPath) return { timezone: null, locale: null };
+
+  // Exit IP (through proxy) is most accurate — gateway DNS may differ from exit
+  let ip = await resolveExitIp(proxyUrl);
+  if (!ip) ip = await resolveProxyIp(proxyUrl);
+  if (!ip) return { timezone: null, locale: null };
+
+  try {
+    const buf = fs.readFileSync(dbPath);
+    const reader = new Reader(buf);
+    const result = reader.get(ip) as any;
+    const timezone: string | null = result?.location?.time_zone ?? null;
+    const countryCode: string | null = result?.country?.iso_code ?? null;
+    const locale =
+      countryCode ? (COUNTRY_LOCALE_MAP[countryCode] ?? null) : null;
+    return { timezone, locale };
+  } catch {
+    return { timezone: null, locale: null };
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Proxy IP resolution
+// ---------------------------------------------------------------------------
+
+/** @internal Exported for testing. */
+export async function resolveProxyIp(
+  proxyUrl: string
+): Promise<string | null> {
+  try {
+    const url = new URL(proxyUrl);
+    const hostname = url.hostname;
+    if (!hostname) return null;
+
+    // Already a literal IP?
+    if (net.isIP(hostname)) return hostname;
+
+    // DNS resolve
+    const { address } = await dns.lookup(hostname);
+    return address;
+  } catch {
+    return null;
+  }
+}
+
+function isPrivateIp(ip: string): boolean {
+  // Quick check for common private ranges
+  if (ip.startsWith("10.") || ip.startsWith("127.") || ip === "::1") return true;
+  if (ip.startsWith("172.")) {
+    const second = parseInt(ip.split(".")[1], 10);
+    if (second >= 16 && second <= 31) return true;
+  }
+  if (ip.startsWith("192.168.")) return true;
+  return false;
+}
+
+const IP_ECHO_URLS = [
+  "https://api.ipify.org",
+  "https://checkip.amazonaws.com",
+  "https://ifconfig.me/ip",
+];
+
+async function resolveExitIp(proxyUrl: string): Promise<string | null> {
+  // Node.js fetch doesn't support proxy natively — use a CONNECT tunnel via http
+  // For simplicity, use a direct HTTP request to a plain-text IP echo service
+  // through the proxy using Node's http module
+  try {
+    const { default: http } = await import("node:http");
+    const { default: https } = await import("node:https");
+    const proxyUrlObj = new URL(proxyUrl);
+
+    for (const echoUrl of IP_ECHO_URLS) {
+      try {
+        const ip = await new Promise<string | null>((resolve, reject) => {
+          const targetUrl = new URL(echoUrl);
+          const connectReq = http.request({
+            host: proxyUrlObj.hostname,
+            port: parseInt(proxyUrlObj.port || "80", 10),
+            method: "CONNECT",
+            path: `${targetUrl.hostname}:443`,
+            headers: proxyUrlObj.username
+              ? {
+                  "Proxy-Authorization":
+                    "Basic " +
+                    Buffer.from(
+                      `${decodeURIComponent(proxyUrlObj.username)}:${decodeURIComponent(proxyUrlObj.password || "")}`
+                    ).toString("base64"),
+                }
+              : {},
+            timeout: 10_000,
+          });
+
+          connectReq.on("connect", (_res, socket) => {
+            const req = https.request(
+              echoUrl,
+              { socket, timeout: 5_000 } as any,
+              (res) => {
+                let data = "";
+                res.on("data", (chunk: Buffer) => (data += chunk.toString()));
+                res.on("end", () => {
+                  const ip = data.trim();
+                  resolve(net.isIP(ip) ? ip : null);
+                });
+              }
+            );
+            req.on("error", () => resolve(null));
+            req.end();
+          });
+
+          connectReq.on("error", () => resolve(null));
+          connectReq.on("timeout", () => {
+            connectReq.destroy();
+            resolve(null);
+          });
+          connectReq.end();
+        });
+
+        if (ip) return ip;
+      } catch {
+        continue;
+      }
+    }
+  } catch {
+    // Fallback: couldn't import http modules
+  }
+  return null;
+}
+
+// ---------------------------------------------------------------------------
+// GeoIP database management
+// ---------------------------------------------------------------------------
+
+function getGeoipDir(): string {
+  return path.join(getCacheDir(), "geoip");
+}
+
+async function ensureGeoipDb(): Promise<string | null> {
+  const dir = getGeoipDir();
+  const dbPath = path.join(dir, GEOIP_DB_FILENAME);
+
+  if (fs.existsSync(dbPath)) {
+    maybeTriggerUpdate(dbPath);
+    return dbPath;
+  }
+
+  try {
+    await downloadGeoipDb(dbPath);
+    return dbPath;
+  } catch {
+    return null;
+  }
+}
+
+async function downloadGeoipDb(dest: string): Promise<void> {
+  const dir = path.dirname(dest);
+  fs.mkdirSync(dir, { recursive: true });
+  console.log("[cloakbrowser] Downloading GeoIP database (~70 MB)…");
+
+  const tmpPath = `${dest}.tmp.${Date.now()}`;
+  try {
+    const response = await fetch(GEOIP_DB_URL, { redirect: "follow" });
+    if (!response.ok || !response.body) {
+      throw new Error(`HTTP ${response.status}`);
+    }
+
+    const fileStream = createWriteStream(tmpPath);
+    const reader = response.body.getReader();
+
+    for (;;) {
+      const { done, value } = await reader.read();
+      if (done) break;
+      fileStream.write(value);
+    }
+
+    await new Promise<void>((resolve, reject) => {
+      fileStream.end(() => resolve());
+      fileStream.on("error", reject);
+    });
+
+    fs.renameSync(tmpPath, dest);
+    console.log(`[cloakbrowser] GeoIP database ready: ${dest}`);
+  } catch (err) {
+    if (fs.existsSync(tmpPath)) fs.unlinkSync(tmpPath);
+    throw err;
+  }
+}
+
+function maybeTriggerUpdate(dbPath: string): void {
+  try {
+    const age = Date.now() - fs.statSync(dbPath).mtimeMs;
+    if (age < GEOIP_UPDATE_INTERVAL_MS) return;
+  } catch {
+    return;
+  }
+  // Fire-and-forget background update
+  downloadGeoipDb(dbPath).catch(() => {});
+}

js/src/index.ts

@@ -0,0 +1,28 @@
+/**
+ * CloakBrowser — Stealth Chromium for Node.js
+ *
+ * Default export uses Playwright. For Puppeteer, import from 'cloakbrowser/puppeteer'.
+ *
+ * @example
+ * ```ts
+ * // Playwright (default)
+ * import { launch } from 'cloakbrowser';
+ * const browser = await launch();
+ *
+ * // Puppeteer
+ * import { launch } from 'cloakbrowser/puppeteer';
+ * const browser = await launch();
+ * ```
+ */
+
+// Launch functions (Playwright API)
+export { launch, launchContext } from "./playwright.js";
+
+// Binary management
+export { ensureBinary, clearCache, binaryInfo, checkForUpdate } from "./download.js";
+
+// Config
+export { CHROMIUM_VERSION, getDefaultStealthArgs } from "./config.js";
+
+// Types
+export type { LaunchOptions, LaunchContextOptions, BinaryInfo } from "./types.js";

js/src/playwright.ts

@@ -0,0 +1,130 @@
+/**
+ * Playwright launch wrapper for cloakbrowser.
+ * Mirrors Python cloakbrowser/browser.py.
+ */
+
+import type { Browser, BrowserContext } from "playwright-core";
+import type { LaunchOptions, LaunchContextOptions } from "./types.js";
+import { DEFAULT_VIEWPORT, getDefaultStealthArgs } from "./config.js";
+import { ensureBinary } from "./download.js";
+import { parseProxyUrl } from "./proxy.js";
+
+/**
+ * Launch stealth Chromium browser via Playwright.
+ *
+ * @example
+ * ```ts
+ * import { launch } from 'cloakbrowser';
+ * const browser = await launch();
+ * const page = await browser.newPage();
+ * await page.goto('https://bot.incolumitas.com');
+ * console.log(await page.title());
+ * await browser.close();
+ * ```
+ */
+export async function launch(options: LaunchOptions = {}): Promise<Browser> {
+  const { chromium } = await import("playwright-core");
+
+  const binaryPath = process.env.CLOAKBROWSER_BINARY_PATH || (await ensureBinary());
+  const resolved = await maybeResolveGeoip(options);
+  const args = buildArgs({ ...options, ...resolved });
+
+  const browser = await chromium.launch({
+    executablePath: binaryPath,
+    headless: options.headless ?? true,
+    args,
+    ignoreDefaultArgs: ["--enable-automation"],
+    ...(options.proxy ? { proxy: parseProxyUrl(options.proxy) } : {}),
+    ...options.launchOptions,
+  });
+
+  return browser;
+}
+
+/**
+ * Launch stealth browser and return a BrowserContext with common options pre-set.
+ * Closing the context also closes the browser.
+ *
+ * @example
+ * ```ts
+ * import { launchContext } from 'cloakbrowser';
+ * const context = await launchContext({
+ *   userAgent: 'Mozilla/5.0...',
+ *   viewport: { width: 1920, height: 1080 },
+ * });
+ * const page = await context.newPage();
+ * await page.goto('https://example.com');
+ * await context.close(); // also closes browser
+ * ```
+ */
+export async function launchContext(
+  options: LaunchContextOptions = {}
+): Promise<BrowserContext> {
+  // Resolve geoip BEFORE launch() to avoid double-resolution
+  const resolved = await maybeResolveGeoip(options);
+  const browser = await launch({ ...options, ...resolved, geoip: false });
+
+  let context: BrowserContext;
+  try {
+    context = await browser.newContext({
+      ...(options.userAgent ? { userAgent: options.userAgent } : {}),
+      viewport: options.viewport ?? DEFAULT_VIEWPORT,
+      ...(resolved.locale ? { locale: resolved.locale } : {}),
+      ...(resolved.timezone ? { timezoneId: resolved.timezone } : {}),
+      ...(options.colorScheme ? { colorScheme: options.colorScheme } : {}),
+    });
+  } catch (err) {
+    await browser.close();
+    throw err;
+  }
+
+  // Patch close() to also close the browser
+  const origClose = context.close.bind(context);
+  context.close = async () => {
+    await origClose();
+    await browser.close();
+  };
+
+  return context;
+}
+
+// ---------------------------------------------------------------------------
+// Internal
+// ---------------------------------------------------------------------------
+
+async function maybeResolveGeoip(
+  options: LaunchOptions
+): Promise<{ timezone?: string; locale?: string }> {
+  if (!options.geoip || !options.proxy) return { timezone: options.timezone, locale: options.locale };
+  if (options.timezone && options.locale) return { timezone: options.timezone, locale: options.locale };
+
+  const { resolveProxyGeo } = await import("./geoip.js");
+  const { timezone: geoTz, locale: geoLocale } = await resolveProxyGeo(options.proxy);
+  return {
+    timezone: options.timezone ?? geoTz ?? undefined,
+    locale: options.locale ?? geoLocale ?? undefined,
+  };
+}
+
+/** @internal Exposed for unit tests only. */
+export function _buildArgsForTest(options: LaunchOptions): string[] {
+  return buildArgs(options);
+}
+
+function buildArgs(options: LaunchOptions): string[] {
+  const args: string[] = [];
+  if (options.stealthArgs !== false) {
+    args.push(...getDefaultStealthArgs());
+  }
+  if (options.args) {
+    args.push(...options.args);
+  }
+  // Timezone/locale flags — always inject when set
+  if (options.timezone) {
+    args.push(`--fingerprint-timezone=${options.timezone}`);
+  }
+  if (options.locale) {
+    args.push(`--lang=${options.locale}`);
+  }
+  return args;
+}

js/src/proxy.ts

@@ -0,0 +1,42 @@
+/**
+ * Shared proxy URL parsing for Playwright and Puppeteer wrappers.
+ */
+
+export interface ParsedProxy {
+  server: string;
+  username?: string;
+  password?: string;
+}
+
+/**
+ * Parse a proxy URL, extracting credentials into separate fields.
+ *
+ * Handles: "http://user:pass@host:port" -> { server: "http://host:port", username: "user", password: "pass" }
+ * Also handles: no credentials, URL-encoded special chars, socks5://, missing port.
+ */
+export function parseProxyUrl(proxy: string): ParsedProxy {
+  let url: URL;
+  try {
+    url = new URL(proxy);
+  } catch {
+    // Not a parseable URL (e.g. bare "host:port") — pass through as-is
+    return { server: proxy };
+  }
+
+  if (!url.username) {
+    return { server: proxy };
+  }
+
+  // Rebuild server URL without credentials
+  const server = `${url.protocol}//${url.hostname}${url.port ? `:${url.port}` : ""}`;
+
+  const result: ParsedProxy = {
+    server,
+    username: decodeURIComponent(url.username),
+  };
+  if (url.password) {
+    result.password = decodeURIComponent(url.password);
+  }
+
+  return result;
+}

js/src/puppeteer.ts

@@ -0,0 +1,99 @@
+/**
+ * Puppeteer launch wrapper for cloakbrowser.
+ * Alternative to the Playwright wrapper for users who prefer Puppeteer.
+ */
+
+import type { Browser } from "puppeteer-core";
+import type { LaunchOptions } from "./types.js";
+import { getDefaultStealthArgs } from "./config.js";
+import { ensureBinary } from "./download.js";
+import { parseProxyUrl } from "./proxy.js";
+
+/**
+ * Launch stealth Chromium browser via Puppeteer.
+ *
+ * @example
+ * ```ts
+ * import { launch } from 'cloakbrowser/puppeteer';
+ * const browser = await launch();
+ * const page = await browser.newPage();
+ * await page.goto('https://bot.incolumitas.com');
+ * console.log(await page.title());
+ * await browser.close();
+ * ```
+ */
+export async function launch(options: LaunchOptions = {}): Promise<Browser> {
+  const puppeteer = await import("puppeteer-core");
+
+  const binaryPath = process.env.CLOAKBROWSER_BINARY_PATH || (await ensureBinary());
+  const resolved = await maybeResolveGeoip(options);
+  const args = buildArgs({ ...options, ...resolved });
+
+  // Puppeteer handles proxy via CLI args, not a separate option.
+  // Chromium's --proxy-server does NOT support inline credentials,
+  // so we strip them and use page.authenticate() instead.
+  let proxyAuth: { username: string; password: string } | undefined;
+  if (options.proxy) {
+    const { server, username, password } = parseProxyUrl(options.proxy);
+    args.push(`--proxy-server=${server}`);
+    if (username) {
+      proxyAuth = { username, password: password || "" };
+    }
+  }
+
+  const browser = await puppeteer.default.launch({
+    executablePath: binaryPath,
+    headless: options.headless ?? true,
+    args,
+    ignoreDefaultArgs: ["--enable-automation"],
+    ...options.launchOptions,
+  });
+
+  // Monkey-patch newPage() to auto-authenticate proxy credentials
+  if (proxyAuth) {
+    const origNewPage = browser.newPage.bind(browser);
+    const auth = proxyAuth;
+    browser.newPage = async (...pageArgs: Parameters<typeof origNewPage>) => {
+      const page = await origNewPage(...pageArgs);
+      await page.authenticate(auth);
+      return page;
+    };
+  }
+
+  return browser;
+}
+
+// ---------------------------------------------------------------------------
+// Internal
+// ---------------------------------------------------------------------------
+
+async function maybeResolveGeoip(
+  options: LaunchOptions
+): Promise<{ timezone?: string; locale?: string }> {
+  if (!options.geoip || !options.proxy) return { timezone: options.timezone, locale: options.locale };
+  if (options.timezone && options.locale) return { timezone: options.timezone, locale: options.locale };
+
+  const { resolveProxyGeo } = await import("./geoip.js");
+  const { timezone: geoTz, locale: geoLocale } = await resolveProxyGeo(options.proxy);
+  return {
+    timezone: options.timezone ?? geoTz ?? undefined,
+    locale: options.locale ?? geoLocale ?? undefined,
+  };
+}
+
+function buildArgs(options: LaunchOptions): string[] {
+  const args: string[] = [];
+  if (options.stealthArgs !== false) {
+    args.push(...getDefaultStealthArgs());
+  }
+  if (options.args) {
+    args.push(...options.args);
+  }
+  if (options.timezone) {
+    args.push(`--fingerprint-timezone=${options.timezone}`);
+  }
+  if (options.locale) {
+    args.push(`--lang=${options.locale}`);
+  }
+  return args;
+}

js/src/types.ts

@@ -0,0 +1,44 @@
+/**
+ * Shared types for cloakbrowser launch wrappers.
+ */
+
+export interface LaunchOptions {
+  /** Run in headless mode (default: true). */
+  headless?: boolean;
+  /** Proxy server URL, e.g. 'http://proxy:8080' or 'socks5://proxy:1080'. */
+  proxy?: string;
+  /** Additional Chromium CLI arguments. */
+  args?: string[];
+  /** Include default stealth fingerprint args (default: true). Set false to use custom --fingerprint flags. */
+  stealthArgs?: boolean;
+  /** IANA timezone, e.g. "America/New_York". Sets --fingerprint-timezone binary flag. */
+  timezone?: string;
+  /** BCP 47 locale, e.g. "en-US". Sets --lang binary flag. */
+  locale?: string;
+  /** Auto-detect timezone/locale from proxy IP (requires: npm install mmdb-lib). */
+  geoip?: boolean;
+  /** Raw options passed directly to playwright/puppeteer launch(). */
+  launchOptions?: Record<string, unknown>;
+}
+
+export interface LaunchContextOptions extends LaunchOptions {
+  /** Custom user agent string. */
+  userAgent?: string;
+  /** Viewport size. */
+  viewport?: { width: number; height: number };
+  /** Browser locale, e.g. "en-US". */
+  locale?: string;
+  /** Timezone, e.g. "America/New_York". */
+  timezoneId?: string;
+  /** Color scheme preference — 'light', 'dark', or 'no-preference'. */
+  colorScheme?: "light" | "dark" | "no-preference";
+}
+
+export interface BinaryInfo {
+  version: string;
+  platform: string;
+  binaryPath: string;
+  installed: boolean;
+  cacheDir: string;
+  downloadUrl: string;
+}

js/tests/config.test.ts

@@ -0,0 +1,100 @@
+import { describe, it, expect } from "vitest";
+import {
+  CHROMIUM_VERSION,
+  getChromiumVersion,
+  getDefaultStealthArgs,
+  getCacheDir,
+  getBinaryDir,
+  getDownloadUrl,
+} from "../src/config.js";
+import { _buildArgsForTest } from "../src/playwright.js";
+
+describe("config", () => {
+  it("CHROMIUM_VERSION matches expected format", () => {
+    expect(CHROMIUM_VERSION).toMatch(/^\d+\.\d+\.\d+\.\d+(\.\d+)?$/);
+  });
+
+  it("getDefaultStealthArgs returns expected flags", () => {
+    const args = getDefaultStealthArgs();
+    const isMac = process.platform === "darwin";
+
+    expect(args).toContain("--no-sandbox");
+    expect(args).toContain("--disable-blink-features=AutomationControlled");
+
+    if (isMac) {
+      expect(args).toContain("--fingerprint-platform=macos");
+      // macOS: no hardware-concurrency or GPU spoofing (uses native values)
+      expect(args.some((a) => a.includes("hardware-concurrency"))).toBe(false);
+    } else {
+      expect(args).toContain("--fingerprint-platform=windows");
+      expect(args).toContain("--fingerprint-hardware-concurrency=8");
+    }
+
+    // Should have a random fingerprint seed
+    const fingerprintArg = args.find((a) => a.startsWith("--fingerprint="));
+    expect(fingerprintArg).toBeDefined();
+    const seed = Number(fingerprintArg!.split("=")[1]);
+    expect(seed).toBeGreaterThanOrEqual(10000);
+    expect(seed).toBeLessThanOrEqual(99999);
+  });
+
+  it("getDefaultStealthArgs generates different seeds", () => {
+    const seeds = new Set<string>();
+    for (let i = 0; i < 10; i++) {
+      const args = getDefaultStealthArgs();
+      const fp = args.find((a) => a.startsWith("--fingerprint="))!;
+      seeds.add(fp);
+    }
+    // With 90k possible seeds, 10 calls should produce at least 2 unique
+    expect(seeds.size).toBeGreaterThan(1);
+  });
+
+  it("getCacheDir returns ~/.cloakbrowser by default", () => {
+    const dir = getCacheDir();
+    expect(dir).toContain(".cloakbrowser");
+  });
+
+  it("getBinaryDir includes platform version", () => {
+    const dir = getBinaryDir();
+    expect(dir).toContain(`chromium-${getChromiumVersion()}`);
+  });
+
+  it("getDownloadUrl contains platform version and platform tag", () => {
+    const url = getDownloadUrl();
+    expect(url).toContain(getChromiumVersion());
+    expect(url).toContain("cloakbrowser-");
+    expect(url).toContain(".tar.gz");
+    expect(url).toContain("cloakbrowser.dev");
+  });
+});
+
+describe("buildArgs timezone/locale", () => {
+  it("injects --fingerprint-timezone when timezone is set", () => {
+    const args = _buildArgsForTest({ timezone: "America/New_York" });
+    expect(args).toContain("--fingerprint-timezone=America/New_York");
+  });
+
+  it("injects --lang when locale is set", () => {
+    const args = _buildArgsForTest({ locale: "en-US" });
+    expect(args).toContain("--lang=en-US");
+  });
+
+  it("injects both when both are set", () => {
+    const args = _buildArgsForTest({ timezone: "Europe/Berlin", locale: "de-DE" });
+    expect(args).toContain("--fingerprint-timezone=Europe/Berlin");
+    expect(args).toContain("--lang=de-DE");
+  });
+
+  it("injects timezone/locale even when stealthArgs=false", () => {
+    const args = _buildArgsForTest({ stealthArgs: false, timezone: "America/New_York", locale: "en-US" });
+    expect(args).toContain("--fingerprint-timezone=America/New_York");
+    expect(args).toContain("--lang=en-US");
+    expect(args.some(a => a.startsWith("--fingerprint="))).toBe(false);
+  });
+
+  it("does not inject flags when not set", () => {
+    const args = _buildArgsForTest({});
+    expect(args.some(a => a.startsWith("--fingerprint-timezone="))).toBe(false);
+    expect(args.some(a => a.startsWith("--lang="))).toBe(false);
+  });
+});

js/tests/geoip.test.ts

@@ -0,0 +1,45 @@
+import { describe, it, expect } from "vitest";
+import { COUNTRY_LOCALE_MAP, resolveProxyIp } from "../src/geoip.js";
+
+describe("resolveProxyIp", () => {
+  it("returns literal IPv4 from proxy URL", async () => {
+    expect(await resolveProxyIp("http://10.50.96.5:8888")).toBe("10.50.96.5");
+  });
+
+  it("handles proxy URL with credentials", async () => {
+    expect(await resolveProxyIp("http://user:pass@10.50.96.5:8888")).toBe(
+      "10.50.96.5"
+    );
+  });
+
+  it("resolves localhost", async () => {
+    const ip = await resolveProxyIp("http://localhost:8888");
+    expect(ip).toBeTruthy();
+    expect(["127.0.0.1", "::1"]).toContain(ip);
+  });
+
+  it("returns null for invalid URL", async () => {
+    expect(await resolveProxyIp("not-a-url")).toBeNull();
+  });
+
+  it("returns null for empty string", async () => {
+    expect(await resolveProxyIp("")).toBeNull();
+  });
+});
+
+describe("COUNTRY_LOCALE_MAP", () => {
+  it("contains common countries", () => {
+    for (const code of ["US", "GB", "DE", "FR", "JP", "BR", "IL", "RU"]) {
+      expect(COUNTRY_LOCALE_MAP[code]).toBeDefined();
+    }
+  });
+
+  it("values are BCP 47 language-REGION format", () => {
+    for (const [code, locale] of Object.entries(COUNTRY_LOCALE_MAP)) {
+      const parts = locale.split("-");
+      expect(parts).toHaveLength(2);
+      expect(parts[0]).toMatch(/^[a-z]{2,3}$/);
+      expect(parts[1]).toMatch(/^[A-Z]{2}$/);
+    }
+  });
+});

js/tests/launch.test.ts

@@ -0,0 +1,39 @@
+import { describe, it, expect } from "vitest";
+import { binaryInfo } from "../src/download.js";
+import { getChromiumVersion } from "../src/config.js";
+
+describe("binaryInfo", () => {
+  it("returns correct structure", () => {
+    const info = binaryInfo();
+
+    expect(info.version).toBe(getChromiumVersion());
+    expect(info.platform).toMatch(/^(linux|darwin|windows)-(x64|arm64)$/);
+    expect(info.binaryPath).toBeTruthy();
+    expect(typeof info.installed).toBe("boolean");
+    expect(info.cacheDir).toContain("cloakbrowser");
+    expect(info.downloadUrl).toContain(".tar.gz");
+  });
+});
+
+// Integration tests require the binary — run with:
+//   CLOAKBROWSER_BINARY_PATH=/path/to/chrome npm test
+describe.skipIf(!process.env.CLOAKBROWSER_BINARY_PATH)(
+  "launch (integration)",
+  () => {
+    it("launches browser and checks stealth", async () => {
+      const { launch } = await import("../src/playwright.js");
+
+      const browser = await launch({ headless: true });
+      const page = await browser.newPage();
+      await page.goto("about:blank");
+
+      const webdriver = await page.evaluate(() => navigator.webdriver);
+      expect(webdriver).toBeFalsy();
+
+      const plugins = await page.evaluate(() => navigator.plugins.length);
+      expect(plugins).toBeGreaterThan(0);
+
+      await browser.close();
+    }, 30_000);
+  }
+);

js/tests/proxy.test.ts

@@ -0,0 +1,49 @@
+import { describe, it, expect } from "vitest";
+import { parseProxyUrl } from "../src/proxy.js";
+
+describe("parseProxyUrl", () => {
+  it("passes through URL without credentials", () => {
+    expect(parseProxyUrl("http://proxy:8080")).toEqual({
+      server: "http://proxy:8080",
+    });
+  });
+
+  it("extracts credentials from URL", () => {
+    expect(parseProxyUrl("http://user:pass@proxy:8080")).toEqual({
+      server: "http://proxy:8080",
+      username: "user",
+      password: "pass",
+    });
+  });
+
+  it("decodes URL-encoded special chars", () => {
+    const result = parseProxyUrl("http://user:p%40ss%3Aword@proxy:8080");
+    expect(result.password).toBe("p@ss:word");
+    expect(result.username).toBe("user");
+    expect(result.server).toBe("http://proxy:8080");
+  });
+
+  it("handles socks5 protocol", () => {
+    const result = parseProxyUrl("socks5://user:pass@proxy:1080");
+    expect(result.server).toBe("socks5://proxy:1080");
+    expect(result.username).toBe("user");
+    expect(result.password).toBe("pass");
+  });
+
+  it("handles URL without port", () => {
+    const result = parseProxyUrl("http://user:pass@proxy");
+    expect(result.server).toBe("http://proxy");
+    expect(result.username).toBe("user");
+  });
+
+  it("handles username only (no password)", () => {
+    const result = parseProxyUrl("http://user@proxy:8080");
+    expect(result.server).toBe("http://proxy:8080");
+    expect(result.username).toBe("user");
+    expect(result.password).toBeUndefined();
+  });
+
+  it("passes through unparseable string", () => {
+    expect(parseProxyUrl("not-a-url")).toEqual({ server: "not-a-url" });
+  });
+});

js/tests/update.test.ts

@@ -0,0 +1,273 @@
+import { describe, it, expect, vi, afterEach, beforeEach } from "vitest";
+import {
+  CHROMIUM_VERSION,
+  getChromiumVersion,
+  getDownloadUrl,
+  getEffectiveVersion,
+  getPlatformTag,
+  parseVersion,
+  versionNewer,
+} from "../src/config.js";
+import {
+  checkWrapperUpdate,
+  getLatestChromiumVersion,
+  parseChecksums,
+  resetWrapperUpdateChecked,
+} from "../src/download.js";
+
+describe("version comparison", () => {
+  it("parseVersion handles 4-part versions", () => {
+    expect(parseVersion("145.0.7718.0")).toEqual([145, 0, 7718, 0]);
+    expect(parseVersion("142.0.7444.175")).toEqual([142, 0, 7444, 175]);
+  });
+
+  it("detects newer version", () => {
+    expect(versionNewer("145.0.7718.0", "142.0.7444.175")).toBe(true);
+  });
+
+  it("detects older version", () => {
+    expect(versionNewer("142.0.7444.175", "145.0.7718.0")).toBe(false);
+  });
+
+  it("same version is not newer", () => {
+    expect(versionNewer("142.0.7444.175", "142.0.7444.175")).toBe(false);
+  });
+
+  it("patch bump detected", () => {
+    expect(versionNewer("142.0.7444.176", "142.0.7444.175")).toBe(true);
+  });
+
+  it("major bump wins over minor", () => {
+    expect(versionNewer("143.0.0.0", "142.9.9999.999")).toBe(true);
+  });
+
+  it("parseVersion handles 5-part build numbers", () => {
+    expect(parseVersion("145.0.7632.109.2")).toEqual([145, 0, 7632, 109, 2]);
+  });
+
+  it("build bump detected", () => {
+    expect(versionNewer("145.0.7632.109.3", "145.0.7632.109.2")).toBe(true);
+  });
+
+  it("build suffix newer than no suffix", () => {
+    expect(versionNewer("145.0.7632.109.2", "145.0.7632.109")).toBe(true);
+  });
+
+  it("no suffix older than build suffix", () => {
+    expect(versionNewer("145.0.7632.109", "145.0.7632.109.2")).toBe(false);
+  });
+});
+
+describe("download URL", () => {
+  it("uses chromium-v prefix and cloakbrowser repo", () => {
+    const url = getDownloadUrl();
+    expect(url).toContain("cloakbrowser.dev");
+    expect(url).toContain(`chromium-v${getChromiumVersion()}`);
+    expect(url.endsWith(".tar.gz")).toBe(true);
+  });
+
+  it("accepts custom version", () => {
+    const url = getDownloadUrl("145.0.7718.0");
+    expect(url).toContain("chromium-v145.0.7718.0");
+  });
+
+  it("does not reference old repo", () => {
+    const url = getDownloadUrl();
+    expect(url).not.toContain("chromium-stealth-builds");
+  });
+});
+
+describe("latest version (platform-aware)", () => {
+  const platformTarball = `cloakbrowser-${getPlatformTag()}.tar.gz`;
+
+  function makeAssets(platforms: string[]) {
+    return platforms.map((p) => ({ name: `cloakbrowser-${p}.tar.gz` }));
+  }
+
+  function mockFetch(releases: Array<Record<string, unknown>>) {
+    return vi.spyOn(globalThis, "fetch").mockResolvedValue({
+      ok: true,
+      json: async () => releases,
+    } as Response);
+  }
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it("returns version when release has platform asset", async () => {
+    mockFetch([
+      {
+        tag_name: "chromium-v145.0.7718.0",
+        draft: false,
+        assets: makeAssets(["linux-x64", "darwin-arm64", "darwin-x64", "windows-x64"]),
+      },
+    ]);
+    expect(await getLatestChromiumVersion()).toBe("145.0.7718.0");
+  });
+
+  it("skips release without platform asset", async () => {
+    const spy = mockFetch([
+      {
+        tag_name: "chromium-v145.0.7718.0",
+        draft: false,
+        assets: makeAssets(["linux-x64"]), // Linux only
+      },
+      {
+        tag_name: "chromium-v142.0.7444.175",
+        draft: false,
+        assets: makeAssets(["linux-x64", "darwin-arm64", "darwin-x64", "windows-x64"]),
+      },
+    ]);
+    const result = await getLatestChromiumVersion();
+    const tag = getPlatformTag();
+    if (tag === "linux-x64") {
+      expect(result).toBe("145.0.7718.0");
+    } else {
+      expect(result).toBe("142.0.7444.175");
+    }
+  });
+
+  it("returns null when no release has platform asset", async () => {
+    mockFetch([
+      {
+        tag_name: "chromium-v145.0.7718.0",
+        draft: false,
+        assets: [{ name: "cloakbrowser-freebsd-x64.tar.gz" }],
+      },
+    ]);
+    expect(await getLatestChromiumVersion()).toBeNull();
+  });
+
+  it("skips draft releases", async () => {
+    const all = ["linux-x64", "darwin-arm64", "darwin-x64", "windows-x64"];
+    mockFetch([
+      { tag_name: "chromium-v999.0.0.0", draft: true, assets: makeAssets(all) },
+      { tag_name: "chromium-v145.0.7718.0", draft: false, assets: makeAssets(all) },
+    ]);
+    expect(await getLatestChromiumVersion()).toBe("145.0.7718.0");
+  });
+
+  it("returns null on network error", async () => {
+    vi.spyOn(globalThis, "fetch").mockRejectedValue(new Error("timeout"));
+    expect(await getLatestChromiumVersion()).toBeNull();
+  });
+});
+
+describe("wrapper update check", () => {
+  beforeEach(() => {
+    resetWrapperUpdateChecked();
+    delete process.env.CLOAKBROWSER_AUTO_UPDATE;
+    delete process.env.CLOAKBROWSER_DOWNLOAD_URL;
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+    delete process.env.CLOAKBROWSER_AUTO_UPDATE;
+    delete process.env.CLOAKBROWSER_DOWNLOAD_URL;
+  });
+
+  it("warns when newer version available", async () => {
+    const spy = vi.spyOn(globalThis, "fetch").mockResolvedValue({
+      ok: true,
+      json: async () => ({ version: "99.0.0" }),
+    } as Response);
+    const warnSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
+
+    await checkWrapperUpdate();
+
+    expect(spy).toHaveBeenCalledOnce();
+    expect(warnSpy).toHaveBeenCalledWith(expect.stringContaining("Update available"));
+  });
+
+  it("silent when current version", async () => {
+    const { WRAPPER_VERSION } = await import("../src/config.js");
+    vi.spyOn(globalThis, "fetch").mockResolvedValue({
+      ok: true,
+      json: async () => ({ version: WRAPPER_VERSION }),
+    } as Response);
+    const warnSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
+
+    await checkWrapperUpdate();
+
+    expect(warnSpy).not.toHaveBeenCalled();
+  });
+
+  it("disabled by CLOAKBROWSER_AUTO_UPDATE=false", async () => {
+    process.env.CLOAKBROWSER_AUTO_UPDATE = "false";
+    const spy = vi.spyOn(globalThis, "fetch");
+
+    await checkWrapperUpdate();
+
+    expect(spy).not.toHaveBeenCalled();
+  });
+
+  it("disabled by CLOAKBROWSER_DOWNLOAD_URL", async () => {
+    process.env.CLOAKBROWSER_DOWNLOAD_URL = "https://mirror.example.com";
+    const spy = vi.spyOn(globalThis, "fetch");
+
+    await checkWrapperUpdate();
+
+    expect(spy).not.toHaveBeenCalled();
+  });
+
+  it("silent on network error", async () => {
+    vi.spyOn(globalThis, "fetch").mockRejectedValue(new Error("timeout"));
+    const warnSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
+
+    await checkWrapperUpdate();
+
+    expect(warnSpy).not.toHaveBeenCalled();
+  });
+
+  it("runs only once per process", async () => {
+    const spy = vi.spyOn(globalThis, "fetch").mockResolvedValue({
+      ok: true,
+      json: async () => ({ version: "0.0.1" }),
+    } as Response);
+
+    await checkWrapperUpdate();
+    await checkWrapperUpdate();
+
+    expect(spy).toHaveBeenCalledOnce();
+  });
+});
+
+describe("parseChecksums", () => {
+  // Valid 64-char hex strings for testing
+  const HASH_A = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
+  const HASH_B = "a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2";
+
+  it("parses standard SHA256SUMS format", () => {
+    const text = [
+      `${HASH_A}  cloakbrowser-linux-x64.tar.gz`,
+      `${HASH_B}  cloakbrowser-darwin-arm64.tar.gz`,
+    ].join("\n");
+    const result = parseChecksums(text);
+    expect(result.get("cloakbrowser-linux-x64.tar.gz")).toBe(HASH_A);
+    expect(result.get("cloakbrowser-darwin-arm64.tar.gz")).toBe(HASH_B);
+  });
+
+  it("handles binary-mode asterisk prefix", () => {
+    const text = `${HASH_A} *cloakbrowser-linux-x64.tar.gz`;
+    const result = parseChecksums(text);
+    expect(result.has("cloakbrowser-linux-x64.tar.gz")).toBe(true);
+  });
+
+  it("skips empty lines", () => {
+    const text = `\n\n${HASH_A}  file.tar.gz\n\n`;
+    expect(parseChecksums(text).size).toBe(1);
+  });
+
+  it("returns empty map for empty input", () => {
+    expect(parseChecksums("").size).toBe(0);
+    expect(parseChecksums("   \n  \n").size).toBe(0);
+  });
+});
+
+describe("effective version", () => {
+  it("returns platform version when no marker exists", () => {
+    // Default behavior — no marker file in test environment
+    expect(getEffectiveVersion()).toBe(getChromiumVersion());
+  });
+});

js/tsconfig.json

@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "outDir": "dist",
+    "rootDir": "src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true
+  },
+  "include": ["src"],
+  "exclude": ["dist", "node_modules", "tests", "examples"]
+}

pyproject.toml

@@ -17,15 +17,22 @@ keywords = [
     "browser",
     "chromium",
     "playwright",
+    "puppeteer",
     "scraping",
+    "web-scraping",
     "anti-detect",
+    "antidetect",
+    "undetected",
+    "bot-detection",
+    "fingerprint",
     "recaptcha",
     "cloudflare",
     "turnstile",
-    "bot-detection",
-    "fingerprint",
-    "web-scraping",
+    "datadome",
+    "captcha",
+    "headless",
     "automation",
+    "ai-agent",
 ]
 classifiers = [
     "Development Status :: 4 - Beta",
@@ -42,10 +49,13 @@ classifiers = [
     "Topic :: Software Development :: Testing",
 ]
 dependencies = [
-    "playwright>=1.40",
+    "patchright>=1.40",
     "httpx>=0.24",
 ]
 
+[project.optional-dependencies]
+geoip = ["geoip2>=4.0"]
+
 [project.urls]
 Homepage = "https://github.com/CloakHQ/CloakBrowser"
 Documentation = "https://github.com/CloakHQ/CloakBrowser#readme"

tests/test_build_args.py

@@ -0,0 +1,46 @@
+"""Unit tests for _build_args timezone/locale injection."""
+
+from cloakbrowser.browser import _build_args
+
+
+def test_timezone_injected():
+    """--fingerprint-timezone flag should appear when timezone is set."""
+    args = _build_args(stealth_args=True, extra_args=None, timezone="America/New_York")
+    assert "--fingerprint-timezone=America/New_York" in args
+
+
+def test_locale_injected():
+    """--lang flag should appear when locale is set."""
+    args = _build_args(stealth_args=True, extra_args=None, locale="en-US")
+    assert "--lang=en-US" in args
+
+
+def test_both_injected():
+    """Both flags should appear when both are set."""
+    args = _build_args(stealth_args=True, extra_args=None, timezone="Europe/Berlin", locale="de-DE")
+    assert "--fingerprint-timezone=Europe/Berlin" in args
+    assert "--lang=de-DE" in args
+
+
+def test_timezone_independent_of_stealth_args():
+    """--fingerprint-timezone should be injected even when stealth_args=False."""
+    args = _build_args(stealth_args=False, extra_args=None, timezone="America/New_York", locale="en-US")
+    assert "--fingerprint-timezone=America/New_York" in args
+    assert "--lang=en-US" in args
+    # No stealth fingerprint args
+    assert not any(a.startswith("--fingerprint=") for a in args)
+
+
+def test_no_flags_when_not_set():
+    """No timezone/lang flags when params are None."""
+    args = _build_args(stealth_args=True, extra_args=None)
+    assert not any(a.startswith("--fingerprint-timezone=") for a in args)
+    assert not any(a.startswith("--lang=") for a in args)
+
+
+def test_extra_args_preserved():
+    """Extra args should still be included alongside timezone/locale."""
+    args = _build_args(stealth_args=True, extra_args=["--disable-gpu"], timezone="Asia/Tokyo", locale="ja-JP")
+    assert "--disable-gpu" in args
+    assert "--fingerprint-timezone=Asia/Tokyo" in args
+    assert "--lang=ja-JP" in args

tests/test_geoip.py

@@ -0,0 +1,138 @@
+"""Unit tests for GeoIP-based timezone/locale detection."""
+
+from unittest.mock import patch
+
+import pytest
+
+from cloakbrowser.browser import _maybe_resolve_geoip
+from cloakbrowser.geoip import (
+    COUNTRY_LOCALE_MAP,
+    _resolve_proxy_ip,
+)
+
+
+# ---------------------------------------------------------------------------
+# _resolve_proxy_ip
+# ---------------------------------------------------------------------------
+
+
+def test_resolve_literal_ipv4():
+    assert _resolve_proxy_ip("http://10.50.96.5:8888") == "10.50.96.5"
+
+
+def test_resolve_literal_ipv4_with_auth():
+    assert _resolve_proxy_ip("http://user:pass@10.50.96.5:8888") == "10.50.96.5"
+
+
+def test_resolve_literal_ipv6():
+    ip = _resolve_proxy_ip("http://[::1]:8888")
+    assert ip == "::1"
+
+
+def test_resolve_hostname():
+    """DNS resolution of a known hostname should return an IP."""
+    ip = _resolve_proxy_ip("http://localhost:8888")
+    assert ip is not None
+    assert ip in ("127.0.0.1", "::1")
+
+
+def test_resolve_invalid_url():
+    assert _resolve_proxy_ip("not-a-url") is None
+
+
+def test_resolve_empty():
+    assert _resolve_proxy_ip("") is None
+
+
+# ---------------------------------------------------------------------------
+# COUNTRY_LOCALE_MAP
+# ---------------------------------------------------------------------------
+
+
+def test_locale_map_has_common_countries():
+    for code in ("US", "GB", "DE", "FR", "JP", "BR", "IL", "RU"):
+        assert code in COUNTRY_LOCALE_MAP, f"Missing {code}"
+
+
+def test_locale_map_values_are_bcp47():
+    """All locales should be language-REGION format."""
+    for code, locale in COUNTRY_LOCALE_MAP.items():
+        parts = locale.split("-")
+        assert len(parts) == 2, f"{code}: {locale} not language-REGION"
+        assert parts[0].islower(), f"{code}: language part should be lowercase"
+        assert parts[1].isupper(), f"{code}: region part should be uppercase"
+
+
+# ---------------------------------------------------------------------------
+# resolve_proxy_geo fallbacks
+# ---------------------------------------------------------------------------
+
+
+def test_resolve_geo_raises_when_geoip2_missing():
+    """Should raise ImportError with install instructions when geoip2 not installed."""
+    with patch.dict("sys.modules", {"geoip2": None, "geoip2.database": None}):
+        from importlib import reload
+        import cloakbrowser.geoip as geoip_mod
+        reload(geoip_mod)
+        with pytest.raises(ImportError, match="pip install cloakbrowser"):
+            geoip_mod.resolve_proxy_geo("http://10.50.96.5:8888")
+        # Restore
+        reload(geoip_mod)
+
+
+def test_resolve_geo_returns_none_when_db_missing():
+    """Should return (None, None) when DB file doesn't exist."""
+    mock_geoip2 = type("module", (), {"database": type("db", (), {"Reader": None})})()
+    with patch.dict("sys.modules", {"geoip2": mock_geoip2, "geoip2.database": mock_geoip2.database}):
+        with patch("cloakbrowser.geoip._ensure_geoip_db", return_value=None):
+            with patch("cloakbrowser.geoip._resolve_exit_ip", return_value=None):
+                from cloakbrowser.geoip import resolve_proxy_geo
+                assert resolve_proxy_geo("http://10.50.96.5:8888") == (None, None)
+
+
+# ---------------------------------------------------------------------------
+# _maybe_resolve_geoip (browser.py helper)
+# ---------------------------------------------------------------------------
+
+
+def test_maybe_resolve_skips_when_geoip_false():
+    tz, loc = _maybe_resolve_geoip(False, "http://proxy:8080", None, None)
+    assert tz is None
+    assert loc is None
+
+
+def test_maybe_resolve_skips_when_no_proxy():
+    tz, loc = _maybe_resolve_geoip(True, None, None, None)
+    assert tz is None
+    assert loc is None
+
+
+def test_maybe_resolve_skips_when_both_explicit():
+    """Explicit values should not trigger geoip resolution."""
+    tz, loc = _maybe_resolve_geoip(True, "http://proxy:8080", "Europe/Berlin", "de-DE")
+    assert tz == "Europe/Berlin"
+    assert loc == "de-DE"
+
+
+def test_maybe_resolve_fills_missing_timezone():
+    """When only locale is explicit, geoip should fill timezone."""
+    with patch("cloakbrowser.geoip.resolve_proxy_geo", return_value=("America/New_York", "en-US")):
+        tz, loc = _maybe_resolve_geoip(True, "http://proxy:8080", None, "fr-FR")
+        assert tz == "America/New_York"
+        assert loc == "fr-FR"  # Explicit wins
+
+
+def test_maybe_resolve_fills_missing_locale():
+    """When only timezone is explicit, geoip should fill locale."""
+    with patch("cloakbrowser.geoip.resolve_proxy_geo", return_value=("America/New_York", "en-US")):
+        tz, loc = _maybe_resolve_geoip(True, "http://proxy:8080", "Asia/Tokyo", None)
+        assert tz == "Asia/Tokyo"  # Explicit wins
+        assert loc == "en-US"
+
+
+def test_maybe_resolve_fills_both():
+    """When neither is set, geoip should fill both."""
+    with patch("cloakbrowser.geoip.resolve_proxy_geo", return_value=("Europe/Berlin", "de-DE")):
+        tz, loc = _maybe_resolve_geoip(True, "http://proxy:8080", None, None)
+        assert tz == "Europe/Berlin"
+        assert loc == "de-DE"

tests/test_launch.py

@@ -1,7 +1,8 @@
 """Basic launch tests for cloakbrowser."""
 
 import pytest
-from cloakbrowser import launch, launch_async, binary_info, CHROMIUM_VERSION
+from cloakbrowser import launch, launch_async, binary_info
+from cloakbrowser.config import get_chromium_version
 
 
 def test_binary_info():
@@ -11,7 +12,7 @@ def test_binary_info():
     assert "platform" in info
     assert "binary_path" in info
     assert "installed" in info
-    assert info["version"] == CHROMIUM_VERSION
+    assert info["version"] == get_chromium_version()
 
 
 def test_launch_and_close():

tests/test_proxy.py

@@ -0,0 +1,50 @@
+"""Tests for proxy URL parsing and credential extraction."""
+
+from cloakbrowser.browser import _build_proxy_kwargs, _parse_proxy_url
+
+
+class TestParseProxyUrl:
+    def test_no_credentials(self):
+        assert _parse_proxy_url("http://proxy:8080") == {"server": "http://proxy:8080"}
+
+    def test_with_credentials(self):
+        result = _parse_proxy_url("http://user:pass@proxy:8080")
+        assert result == {"server": "http://proxy:8080", "username": "user", "password": "pass"}
+
+    def test_url_encoded_password(self):
+        result = _parse_proxy_url("http://user:p%40ss%3Aword@proxy:8080")
+        assert result["password"] == "p@ss:word"
+        assert result["username"] == "user"
+        assert result["server"] == "http://proxy:8080"
+
+    def test_socks5(self):
+        result = _parse_proxy_url("socks5://user:pass@proxy:1080")
+        assert result["server"] == "socks5://proxy:1080"
+        assert result["username"] == "user"
+        assert result["password"] == "pass"
+
+    def test_no_port(self):
+        result = _parse_proxy_url("http://user:pass@proxy")
+        assert result["server"] == "http://proxy"
+        assert result["username"] == "user"
+
+    def test_username_only(self):
+        result = _parse_proxy_url("http://user@proxy:8080")
+        assert result["server"] == "http://proxy:8080"
+        assert result["username"] == "user"
+        assert "password" not in result
+
+
+class TestBuildProxyKwargs:
+    def test_none(self):
+        assert _build_proxy_kwargs(None) == {}
+
+    def test_simple_proxy(self):
+        result = _build_proxy_kwargs("http://proxy:8080")
+        assert result == {"proxy": {"server": "http://proxy:8080"}}
+
+    def test_proxy_with_auth(self):
+        result = _build_proxy_kwargs("http://user:pass@proxy:8080")
+        assert result == {
+            "proxy": {"server": "http://proxy:8080", "username": "user", "password": "pass"}
+        }

tests/test_stealth.py

@@ -4,14 +4,19 @@ These tests verify that the stealth Chromium binary passes common
 bot detection checks. They require network access.
 """
 
+import os
+import time
+
 import pytest
 from cloakbrowser import launch
 
+PROXY = os.environ.get("CLOAKBROWSER_TEST_PROXY")
+
 
 @pytest.fixture(scope="module")
 def browser():
     """Shared browser instance for stealth tests."""
-    b = launch(headless=True)
+    b = launch(headless=True, proxy=PROXY)
     yield b
     b.close()
 
@@ -48,7 +53,7 @@ class TestWebDriverDetection:
         """Must have browser plugins (real Chrome has 5)."""
         page.goto("https://example.com")
         count = page.evaluate("navigator.plugins.length")
-        assert count >= 1, f"Expected plugins, got {count}"
+        assert count >= 5, f"Expected 5+ plugins (real Chrome), got {count}"
 
     def test_languages_present(self, page):
         """navigator.languages must be populated."""
@@ -81,28 +86,134 @@ class TestBotDetectionSites:
     Mark with pytest -m slow to skip in CI.
     """
 
+    @pytest.mark.slow
+    def test_bot_sannysoft(self, page):
+        """bot.sannysoft.com — all checks should pass (0 failures)."""
+        page.goto("https://bot.sannysoft.com", wait_until="networkidle", timeout=30000)
+        time.sleep(3)
+
+        results = page.evaluate("""() => {
+            const rows = document.querySelectorAll('table tr');
+            const failed = [];
+            let total = 0;
+            rows.forEach(r => {
+                const cells = r.querySelectorAll('td');
+                if (cells.length >= 2) {
+                    total++;
+                    const cls = cells[1].className || '';
+                    if (cls.includes('failed')) {
+                        failed.push(cells[0].innerText.trim());
+                    }
+                }
+            });
+            return {total, failed};
+        }""")
+
+        failed = results["failed"]
+        assert len(failed) == 0, f"Sannysoft failures: {', '.join(failed)}"
+
     @pytest.mark.slow
     def test_bot_incolumitas(self, page):
-        """bot.incolumitas.com should detect minimal flags."""
-        page.goto("https://bot.incolumitas.com", timeout=30000)
-        page.wait_for_timeout(5000)
-        # Check that we're not immediately flagged
-        title = page.title()
-        assert title  # Page loaded successfully
+        """bot.incolumitas.com — max 1 failure (WEBDRIVER false positive expected)."""
+        page.goto("https://bot.incolumitas.com", wait_until="networkidle", timeout=30000)
+        time.sleep(12)
+
+        # Known acceptable failures (not browser fingerprint issues):
+        # - WEBDRIVER: spec-level false positive across all builds
+        # - connectionRTT: detects datacenter/proxy network latency, not browser
+        KNOWN_ACCEPTABLE = {"WEBDRIVER", "connectionRTT"}
+
+        results = page.evaluate("""() => {
+            const text = document.body.innerText;
+            const okMatches = text.match(/"\\w+":\\s*"OK"/g) || [];
+            const failMatches = text.match(/"\\w+":\\s*"FAIL"/g) || [];
+            const failedTests = failMatches.map(m => m.match(/"(\\w+)"/)[1]);
+            return {passed: okMatches.length, failed: failMatches.length, failedTests};
+        }""")
+
+        failed_names = results["failedTests"]
+        real_failures = [f for f in failed_names if f not in KNOWN_ACCEPTABLE]
+        assert len(real_failures) == 0, f"Incolumitas unexpected failures: {', '.join(real_failures)}"
 
     @pytest.mark.slow
     def test_browserscan(self, page):
-        """BrowserScan bot detection should show NORMAL."""
-        page.goto("https://www.browserscan.net/bot-detection", timeout=30000)
-        page.wait_for_timeout(5000)
-        title = page.title()
-        assert title  # Page loaded
+        """BrowserScan bot detection — 0 abnormal checks."""
+        page.goto("https://www.browserscan.net/bot-detection", wait_until="networkidle", timeout=30000)
+        time.sleep(5)
+
+        results = page.evaluate("""() => {
+            const text = document.body.innerText;
+            const normalMatches = text.match(/Normal/g);
+            const abnormalMatches = text.match(/Abnormal/g);
+            return {
+                normal: normalMatches ? normalMatches.length : 0,
+                abnormal: abnormalMatches ? abnormalMatches.length : 0
+            };
+        }""")
+
+        assert results["abnormal"] == 0, \
+            f"BrowserScan: {results['abnormal']} abnormal, {results['normal']} normal"
 
     @pytest.mark.slow
     def test_device_and_browser_info(self, page):
-        """deviceandbrowserinfo.com should report isBot: false."""
-        page.goto("https://deviceandbrowserinfo.com/are_you_a_bot", timeout=30000)
-        page.wait_for_timeout(5000)
-        content = page.content()
-        # The page shows bot detection results
-        assert "deviceandbrowserinfo" in page.url.lower()
+        """deviceandbrowserinfo.com — isBot must be false."""
+        page.goto("https://deviceandbrowserinfo.com/are_you_a_bot", wait_until="domcontentloaded", timeout=30000)
+        time.sleep(8)
+
+        results = page.evaluate("""() => {
+            const text = document.body.innerText;
+            const botMatch = text.match(/"isBot":\\s*(true|false)/);
+            const isBot = botMatch ? botMatch[1] === 'true' : null;
+            const checks = {};
+            ['isBot', 'hasBotUserAgent', 'hasWebdriverTrue', 'isHeadlessChrome',
+             'isAutomatedWithCDP', 'hasSuspiciousWeakSignals', 'isPlaywright',
+             'hasInconsistentChromeObject'].forEach(p => {
+                const match = text.match(new RegExp('"' + p + '":\\s*(true|false)'));
+                if (match) checks[p] = match[1] === 'true';
+            });
+            return {isBot, checks};
+        }""")
+
+        assert results["isBot"] is False, f"Detected as bot! Checks: {results['checks']}"
+
+    @pytest.mark.slow
+    def test_fingerprintjs(self, page):
+        """FingerprintJS — must not be blocked, should see flight data."""
+        page.goto("https://demo.fingerprint.com/web-scraping", wait_until="domcontentloaded", timeout=30000)
+        time.sleep(8)
+
+        try:
+            page.click("button:has-text('Search')", timeout=5000)
+            time.sleep(5)
+        except Exception:
+            pass
+
+        results = page.evaluate("""() => {
+            const text = document.body.innerText;
+            const hasFlights = text.includes('Price per adult') || text.includes('$');
+            const isBlocked = text.includes('request was blocked') || text.includes('bot visit detected');
+            return {passed: hasFlights && !isBlocked, isBlocked, hasFlights};
+        }""")
+
+        assert not results["isBlocked"], "FingerprintJS blocked us as a bot"
+        assert results["passed"], "FingerprintJS: no flight data shown"
+
+    @pytest.mark.slow
+    def test_recaptcha_v3(self, page):
+        """reCAPTCHA v3 — score must be >= 0.7."""
+        page.goto(
+            "https://recaptcha-demo.appspot.com/recaptcha-v3-request-scores.php",
+            wait_until="domcontentloaded",
+            timeout=60000,
+        )
+        time.sleep(8)
+
+        results = page.evaluate("""() => {
+            const text = document.body.innerText;
+            const scoreMatch = text.match(/"score":\\s*(\\d+\\.\\d+)/);
+            return {score: scoreMatch ? parseFloat(scoreMatch[1]) : null};
+        }""")
+
+        score = results["score"]
+        assert score is not None, "Could not extract reCAPTCHA score"
+        assert score >= 0.7, f"reCAPTCHA score too low: {score}"

tests/test_update.py

@@ -0,0 +1,358 @@
+"""Tests for auto-update and version management."""
+
+from __future__ import annotations
+
+import hashlib
+import os
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from cloakbrowser.config import (
+    CHROMIUM_VERSION,
+    _version_newer,
+    _version_tuple,
+    get_chromium_version,
+    get_download_url,
+    get_effective_version,
+    get_platform_tag,
+)
+from cloakbrowser.download import (
+    _check_wrapper_update,
+    _get_latest_chromium_version,
+    _parse_checksums,
+    _should_check_for_update,
+    _verify_checksum,
+)
+
+
+class TestVersionComparison:
+    def test_version_tuple_parsing(self):
+        assert _version_tuple("145.0.7718.0") == (145, 0, 7718, 0)
+        assert _version_tuple("142.0.7444.175") == (142, 0, 7444, 175)
+
+    def test_newer_version(self):
+        assert _version_newer("145.0.7718.0", "142.0.7444.175") is True
+
+    def test_older_version(self):
+        assert _version_newer("142.0.7444.175", "145.0.7718.0") is False
+
+    def test_same_version(self):
+        assert _version_newer("142.0.7444.175", "142.0.7444.175") is False
+
+    def test_patch_bump(self):
+        assert _version_newer("142.0.7444.176", "142.0.7444.175") is True
+
+    def test_major_bump(self):
+        assert _version_newer("143.0.0.0", "142.9.9999.999") is True
+
+    def test_5th_segment_parsing(self):
+        assert _version_tuple("145.0.7632.109.2") == (145, 0, 7632, 109, 2)
+
+    def test_build_bump(self):
+        assert _version_newer("145.0.7632.109.3", "145.0.7632.109.2") is True
+
+    def test_build_suffix_newer_than_no_suffix(self):
+        assert _version_newer("145.0.7632.109.2", "145.0.7632.109") is True
+
+    def test_no_suffix_older_than_build_suffix(self):
+        assert _version_newer("145.0.7632.109", "145.0.7632.109.2") is False
+
+    def test_new_chromium_beats_old_build(self):
+        assert _version_newer("146.0.0.0", "145.0.7632.109.2") is True
+
+
+class TestDownloadUrl:
+    def test_default_url_format(self):
+        url = get_download_url()
+        assert "cloakbrowser.dev" in url
+        assert f"chromium-v{get_chromium_version()}" in url
+        assert url.endswith(".tar.gz")
+
+    def test_custom_version_url(self):
+        url = get_download_url("145.0.7718.0")
+        assert "chromium-v145.0.7718.0" in url
+
+    def test_no_old_repo_reference(self):
+        url = get_download_url()
+        assert "chromium-stealth-builds" not in url
+
+
+class TestShouldCheckForUpdate:
+    def test_disabled_by_env(self):
+        with patch.dict(os.environ, {"CLOAKBROWSER_AUTO_UPDATE": "false"}):
+            assert _should_check_for_update() is False
+
+    def test_disabled_by_env_case_insensitive(self):
+        with patch.dict(os.environ, {"CLOAKBROWSER_AUTO_UPDATE": "False"}):
+            assert _should_check_for_update() is False
+
+    def test_disabled_by_binary_override(self):
+        with patch.dict(os.environ, {"CLOAKBROWSER_BINARY_PATH": "/some/path"}):
+            assert _should_check_for_update() is False
+
+    def test_disabled_by_custom_download_url(self):
+        with patch.dict(
+            os.environ, {"CLOAKBROWSER_DOWNLOAD_URL": "https://my-mirror.com"}
+        ):
+            assert _should_check_for_update() is False
+
+    def test_rate_limited(self, tmp_path):
+        import time
+
+        with patch.dict(
+            os.environ,
+            {
+                "CLOAKBROWSER_CACHE_DIR": str(tmp_path),
+                "CLOAKBROWSER_BINARY_PATH": "",
+                "CLOAKBROWSER_AUTO_UPDATE": "",
+                "CLOAKBROWSER_DOWNLOAD_URL": "",
+            },
+        ):
+            check_file = tmp_path / ".last_update_check"
+            check_file.write_text(str(time.time()))
+            assert _should_check_for_update() is False
+
+    def test_stale_rate_limit_allows_check(self, tmp_path):
+        import time
+
+        with patch.dict(
+            os.environ,
+            {
+                "CLOAKBROWSER_CACHE_DIR": str(tmp_path),
+                "CLOAKBROWSER_BINARY_PATH": "",
+                "CLOAKBROWSER_AUTO_UPDATE": "",
+                "CLOAKBROWSER_DOWNLOAD_URL": "",
+            },
+        ):
+            check_file = tmp_path / ".last_update_check"
+            check_file.write_text(str(time.time() - 7200))  # 2 hours ago
+            assert _should_check_for_update() is True
+
+
+class TestEffectiveVersion:
+    def test_no_marker_returns_platform_version(self, tmp_path):
+        with patch.dict(os.environ, {"CLOAKBROWSER_CACHE_DIR": str(tmp_path)}):
+            assert get_effective_version() == get_chromium_version()
+
+    def test_marker_with_newer_version(self, tmp_path):
+        with patch.dict(os.environ, {"CLOAKBROWSER_CACHE_DIR": str(tmp_path)}):
+            marker = tmp_path / f"latest_version_{get_platform_tag()}"
+            marker.write_text("999.0.0.0")
+            # Binary doesn't exist, so should fall back
+            assert get_effective_version() == get_chromium_version()
+
+    def test_marker_with_older_version_ignored(self, tmp_path):
+        with patch.dict(os.environ, {"CLOAKBROWSER_CACHE_DIR": str(tmp_path)}):
+            marker = tmp_path / f"latest_version_{get_platform_tag()}"
+            marker.write_text("100.0.0.0")
+            assert get_effective_version() == get_chromium_version()
+
+
+class TestGetLatestVersion:
+    """Tests for _get_latest_chromium_version with platform-aware asset checking."""
+
+    def _make_assets(self, platforms: list[str]) -> list[dict]:
+        """Helper to build asset list from platform tags."""
+        return [{"name": f"cloakbrowser-{p}.tar.gz"} for p in platforms]
+
+    def _platform_tarball(self) -> str:
+        return f"cloakbrowser-{get_platform_tag()}.tar.gz"
+
+    def test_parses_chromium_tag_with_platform_asset(self):
+        mock_response = MagicMock()
+        mock_response.json.return_value = [
+            {
+                "tag_name": "chromium-v145.0.7718.0",
+                "draft": False,
+                "assets": self._make_assets(["linux-x64", "darwin-arm64", "darwin-x64", "windows-x64"]),
+            },
+        ]
+        mock_response.raise_for_status = MagicMock()
+
+        with patch("cloakbrowser.download.httpx.get", return_value=mock_response):
+            result = _get_latest_chromium_version()
+            assert result == "145.0.7718.0"
+
+    def test_skips_release_without_platform_asset(self):
+        """If latest release has no asset for our platform, fall back to older release."""
+        mock_response = MagicMock()
+        mock_response.json.return_value = [
+            {
+                "tag_name": "chromium-v145.0.7718.0",
+                "draft": False,
+                "assets": self._make_assets(["linux-x64"]),  # Linux only
+            },
+            {
+                "tag_name": "chromium-v142.0.7444.175",
+                "draft": False,
+                "assets": self._make_assets(["linux-x64", "darwin-arm64", "darwin-x64", "windows-x64"]),
+            },
+        ]
+        mock_response.raise_for_status = MagicMock()
+
+        with patch("cloakbrowser.download.httpx.get", return_value=mock_response):
+            result = _get_latest_chromium_version()
+            tag = get_platform_tag()
+            if tag == "linux-x64":
+                assert result == "145.0.7718.0"
+            else:
+                assert result == "142.0.7444.175"
+
+    def test_skips_draft_releases(self):
+        mock_response = MagicMock()
+        all_platforms = ["linux-x64", "darwin-arm64", "darwin-x64", "windows-x64"]
+        mock_response.json.return_value = [
+            {"tag_name": "chromium-v999.0.0.0", "draft": True, "assets": self._make_assets(all_platforms)},
+            {"tag_name": "chromium-v145.0.7718.0", "draft": False, "assets": self._make_assets(all_platforms)},
+        ]
+        mock_response.raise_for_status = MagicMock()
+
+        with patch("cloakbrowser.download.httpx.get", return_value=mock_response):
+            result = _get_latest_chromium_version()
+            assert result == "145.0.7718.0"
+
+    def test_skips_non_chromium_tags(self):
+        mock_response = MagicMock()
+        all_platforms = ["linux-x64", "darwin-arm64", "darwin-x64", "windows-x64"]
+        mock_response.json.return_value = [
+            {"tag_name": "v0.2.0", "draft": False, "assets": self._make_assets(all_platforms)},
+            {"tag_name": "chromium-v145.0.7718.0", "draft": False, "assets": self._make_assets(all_platforms)},
+        ]
+        mock_response.raise_for_status = MagicMock()
+
+        with patch("cloakbrowser.download.httpx.get", return_value=mock_response):
+            result = _get_latest_chromium_version()
+            assert result == "145.0.7718.0"
+
+    def test_returns_none_when_no_platform_assets(self):
+        """If no release has our platform, return None."""
+        mock_response = MagicMock()
+        mock_response.json.return_value = [
+            {
+                "tag_name": "chromium-v145.0.7718.0",
+                "draft": False,
+                "assets": [{"name": "cloakbrowser-freebsd-x64.tar.gz"}],
+            },
+        ]
+        mock_response.raise_for_status = MagicMock()
+
+        with patch("cloakbrowser.download.httpx.get", return_value=mock_response):
+            result = _get_latest_chromium_version()
+            assert result is None
+
+    def test_network_error_returns_none(self):
+        with patch("cloakbrowser.download.httpx.get", side_effect=Exception("timeout")):
+            result = _get_latest_chromium_version()
+            assert result is None
+
+
+class TestWrapperUpdateCheck:
+    """Tests for _check_wrapper_update (PyPI version check)."""
+
+    def setup_method(self):
+        import cloakbrowser.download as dl
+        dl._wrapper_update_checked = False
+
+    def test_warns_when_newer_version_available(self, caplog):
+        mock_resp = MagicMock()
+        mock_resp.json.return_value = {"info": {"version": "99.0.0"}}
+        mock_resp.raise_for_status = MagicMock()
+
+        with patch("cloakbrowser.download.httpx.get", return_value=mock_resp):
+            import logging
+            with caplog.at_level(logging.WARNING):
+                _check_wrapper_update()
+            assert "Update available" in caplog.text
+            assert "99.0.0" in caplog.text
+
+    def test_silent_when_current(self, caplog):
+        import cloakbrowser.download as dl
+        mock_resp = MagicMock()
+        mock_resp.json.return_value = {"info": {"version": dl._wrapper_version}}
+        mock_resp.raise_for_status = MagicMock()
+
+        with patch("cloakbrowser.download.httpx.get", return_value=mock_resp):
+            import logging
+            with caplog.at_level(logging.WARNING):
+                _check_wrapper_update()
+            assert "Update available" not in caplog.text
+
+    def test_disabled_by_auto_update_env(self):
+        with patch.dict(os.environ, {"CLOAKBROWSER_AUTO_UPDATE": "false"}):
+            with patch("cloakbrowser.download.httpx.get") as mock_get:
+                _check_wrapper_update()
+                mock_get.assert_not_called()
+
+    def test_disabled_by_custom_download_url(self):
+        with patch.dict(os.environ, {"CLOAKBROWSER_DOWNLOAD_URL": "https://mirror.example.com"}):
+            with patch("cloakbrowser.download.httpx.get") as mock_get:
+                _check_wrapper_update()
+                mock_get.assert_not_called()
+
+    def test_network_error_silent(self, caplog):
+        with patch("cloakbrowser.download.httpx.get", side_effect=Exception("timeout")):
+            import logging
+            with caplog.at_level(logging.WARNING):
+                _check_wrapper_update()
+            assert "Update available" not in caplog.text
+
+    def test_runs_only_once(self):
+        mock_resp = MagicMock()
+        mock_resp.json.return_value = {"info": {"version": "0.0.1"}}
+        mock_resp.raise_for_status = MagicMock()
+
+        with patch("cloakbrowser.download.httpx.get", return_value=mock_resp) as mock_get:
+            _check_wrapper_update()
+            _check_wrapper_update()
+            assert mock_get.call_count == 1
+
+
+class TestParseChecksums:
+    HASH_A = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+    HASH_B = "a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2"
+
+    def test_standard_format(self):
+        text = (
+            f"{self.HASH_A}  cloakbrowser-linux-x64.tar.gz\n"
+            f"{self.HASH_B}  cloakbrowser-darwin-arm64.tar.gz\n"
+        )
+        result = _parse_checksums(text)
+        assert result["cloakbrowser-linux-x64.tar.gz"] == self.HASH_A
+        assert result["cloakbrowser-darwin-arm64.tar.gz"] == self.HASH_B
+
+    def test_binary_mode_asterisk(self):
+        text = f"{self.HASH_A} *cloakbrowser-linux-x64.tar.gz\n"
+        result = _parse_checksums(text)
+        assert "cloakbrowser-linux-x64.tar.gz" in result
+
+    def test_empty_lines_skipped(self):
+        text = f"\n\n{self.HASH_A}  file.tar.gz\n\n"
+        result = _parse_checksums(text)
+        assert len(result) == 1
+
+    def test_uppercase_lowered(self):
+        text = f"{self.HASH_A.upper()}  file.tar.gz\n"
+        result = _parse_checksums(text)
+        assert result["file.tar.gz"] == self.HASH_A
+
+    def test_empty_input(self):
+        assert _parse_checksums("") == {}
+        assert _parse_checksums("   \n  \n") == {}
+
+
+class TestVerifyChecksum:
+    def test_matching_checksum(self, tmp_path):
+        content = b"test binary content"
+        file = tmp_path / "test.tar.gz"
+        file.write_bytes(content)
+        expected = hashlib.sha256(content).hexdigest()
+        # Should not raise
+        _verify_checksum(file, expected)
+
+    def test_mismatched_checksum(self, tmp_path):
+        file = tmp_path / "test.tar.gz"
+        file.write_bytes(b"real content")
+        with pytest.raises(RuntimeError, match="Checksum verification failed"):
+            _verify_checksum(file, "0" * 64)