diff --git a/src/components/challenge-modal/__tests__/challenge-modal.test.tsx b/src/components/challenge-modal/__tests__/challenge-modal.test.tsx
index 08ebe0a3..3f49a4ad 100644
--- a/src/components/challenge-modal/__tests__/challenge-modal.test.tsx
+++ b/src/components/challenge-modal/__tests__/challenge-modal.test.tsx
@@ -15,6 +15,7 @@ const testState = vi.hoisted(() => ({
       address: '0xabc123',
     },
   } as Record<string, any>,
+  capacitorPlatform: 'web',
   challenges: [] as Array<{ challenge: any; id: number }>,
   commentsByCid: {} as Record<string, { author?: { shortAddress?: string } }>,
   publicationPreview: 'preview body',
@@ -44,6 +45,12 @@ vi.mock('@bitsocial/bitsocial-react-hooks', () => ({
   useComment: ({ commentCid }: { commentCid?: string }) => (commentCid ? testState.commentsByCid[commentCid] : undefined),
 }));
 
+vi.mock('@capacitor/core', () => ({
+  Capacitor: {
+    getPlatform: () => testState.capacitorPlatform,
+  },
+}));
+
 vi.mock('../../../lib/utils/challenge-utils', () => ({
   getPublicationPreview: () => testState.publicationPreview,
   getPublicationType: () => testState.publicationType,
@@ -139,6 +146,13 @@ const clickButton = async (text: string) => {
   });
 };
 
+const setNavigatorValue = (key: keyof Navigator, value: unknown) => {
+  Object.defineProperty(window.navigator, key, {
+    configurable: true,
+    value,
+  });
+};
+
 describe('ChallengeModal', () => {
   beforeEach(() => {
     vi.clearAllMocks();
@@ -148,6 +162,7 @@ describe('ChallengeModal', () => {
         address: '0xabc123',
       },
     };
+    testState.capacitorPlatform = 'web';
     testState.challenges = [];
     testState.commentsByCid = {
       'parent-1': {
@@ -162,6 +177,10 @@ describe('ChallengeModal', () => {
     testState.springStartMock.mockReset();
     testState.theme = 'dark';
     testState.votePreview = 'upvote';
+    setNavigatorValue('maxTouchPoints', 0);
+    setNavigatorValue('platform', 'MacIntel');
+    setNavigatorValue('userAgent', 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125 Safari/537.36');
+    setNavigatorValue('vendor', 'Google Inc.');
     alertSpy = vi.spyOn(window, 'alert').mockImplementation(() => undefined);
     confirmSpy = vi.spyOn(window, 'confirm').mockImplementation(() => true);
     consoleErrorSpy = vi.spyOn(console, 'error').mockImplementation(() => undefined);
@@ -465,6 +484,113 @@ describe('ChallengeModal', () => {
     expect(container.querySelector('iframe')).toBeNull();
   });
 
+  it('uses inline iframe confirmation on Android instead of window.confirm', async () => {
+    const publication = createPublication();
+    testState.capacitorPlatform = 'android';
+    testState.publicationType = 'reply';
+    testState.challenges = [
+      createStoredChallenge(
+        {
+          challenge: 'https://spamblocker.bitsocial.net/api/v1/iframe/session-123',
+          type: 'url/iframe',
+        },
+        {
+          ...publication,
+          content: '>>17\nreply from android',
+          title: '',
+        },
+      ),
+    ];
+
+    await renderModal();
+
+    expect(confirmSpy).not.toHaveBeenCalled();
+    expect(container.textContent).toContain('spamblocker.bitsocial.net');
+    expect(container.textContent).toContain('mu wants to open spamblocker.bitsocial.net.\n\nFor reply: >>17 reply from android');
+    expect(container.textContent).toContain('Open');
+    expect(container.textContent).toContain('close');
+    expect(container.textContent).not.toContain('Challenge for reply');
+    expect(container.querySelector('iframe')).toBeNull();
+
+    await clickButton('Open');
+
+    const iframe = container.querySelector('iframe');
+    expect(iframe).not.toBeNull();
+    expect(iframe?.getAttribute('src')).toContain('https://spamblocker.bitsocial.net/api/v1/iframe/session-123?theme=dark');
+    expect(testState.abandonCurrentChallengeMock).not.toHaveBeenCalled();
+  });
+
+  it('abandons Android iframe challenges when inline confirmation is closed', async () => {
+    testState.capacitorPlatform = 'android';
+    testState.challenges = [
+      createStoredChallenge({
+        challenge: 'https://spamblocker.bitsocial.net/api/v1/iframe/session-123',
+        type: 'url/iframe',
+      }),
+    ];
+
+    await renderModal();
+    await clickButton('close');
+
+    expect(confirmSpy).not.toHaveBeenCalled();
+    expect(testState.abandonCurrentChallengeMock).toHaveBeenCalledOnce();
+    expect(container.querySelector('iframe')).toBeNull();
+  });
+
+  it('uses inline iframe confirmation on Safari instead of window.confirm', async () => {
+    testState.publicationType = 'reply';
+    setNavigatorValue('userAgent', 'Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Safari/605.1.15');
+    setNavigatorValue('vendor', 'Apple Computer, Inc.');
+    testState.challenges = [
+      createStoredChallenge(
+        {
+          challenge: 'https://spamblocker.bitsocial.net/api/v1/iframe/session-123',
+          type: 'url/iframe',
+        },
+        {
+          ...createPublication(),
+          content: '>>17\nreply from safari',
+          title: '',
+        },
+      ),
+    ];
+
+    await renderModal();
+
+    expect(confirmSpy).not.toHaveBeenCalled();
+    expect(container.textContent).toContain('mu wants to open spamblocker.bitsocial.net.\n\nFor reply: >>17 reply from safari');
+    expect(container.querySelector('iframe')).toBeNull();
+
+    await clickButton('Open');
+
+    const iframe = container.querySelector('iframe');
+    expect(iframe).not.toBeNull();
+    expect(iframe?.getAttribute('src')).toContain('https://spamblocker.bitsocial.net/api/v1/iframe/session-123?theme=dark');
+  });
+
+  it('shows iframe challenge errors inline on Safari instead of relying on alert', async () => {
+    testState.account = { author: { address: '' } };
+    setNavigatorValue('userAgent', 'Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Safari/605.1.15');
+    setNavigatorValue('vendor', 'Apple Computer, Inc.');
+    testState.challenges = [
+      createStoredChallenge({
+        challenge: 'https://mintpass.org/auth?user={userAddress}',
+        type: 'url/iframe',
+      }),
+    ];
+
+    await renderModal();
+    await clickButton('Open');
+
+    expect(alertSpy).not.toHaveBeenCalled();
+    expect(container.textContent).toContain('Error: Unable to load challenge without your address. Please sign in and try again.');
+    expect(container.textContent).not.toContain('Open');
+    expect(container.querySelector('iframe')).toBeNull();
+
+    await clickButton('close');
+    expect(testState.abandonCurrentChallengeMock).toHaveBeenCalledOnce();
+  });
+
   it('alerts when iframe challenges need a signer address and the account is missing one', async () => {
     testState.account = { author: { address: '' } };
     testState.challenges = [
diff --git a/src/components/challenge-modal/challenge-modal.module.css b/src/components/challenge-modal/challenge-modal.module.css
index 662b46b5..59582ee1 100644
--- a/src/components/challenge-modal/challenge-modal.module.css
+++ b/src/components/challenge-modal/challenge-modal.module.css
@@ -112,6 +112,18 @@
   margin: 10px 0;
 }
 
+.iframeConsentWrapper {
+  justify-content: flex-start;
+  margin: 10px 8px;
+}
+
+.iframeConsentMessage {
+  white-space: pre-wrap;
+  overflow-wrap: anywhere;
+  word-break: normal;
+  line-height: 1.35;
+}
+
 .iframe {
   width: 100%;
   height: 100%;
diff --git a/src/components/challenge-modal/challenge-modal.tsx b/src/components/challenge-modal/challenge-modal.tsx
index d12a0f93..619ea4dd 100644
--- a/src/components/challenge-modal/challenge-modal.tsx
+++ b/src/components/challenge-modal/challenge-modal.tsx
@@ -1,6 +1,7 @@
 import { useRef, useState, useEffect, useCallback } from 'react';
 import { useTranslation } from 'react-i18next';
 import { Challenge as ChallengeType, useAccount, useComment } from '@bitsocial/bitsocial-react-hooks';
+import { Capacitor } from '@capacitor/core';
 import { getPublicationPreview, getPublicationType, getVotePreview, type ChallengePublication } from '../../lib/utils/challenge-utils';
 import useIsMobile from '../../hooks/use-is-mobile';
 import useChallengesStore from '../../stores/use-challenges-store';
@@ -44,6 +45,23 @@ const getDisplayCommunityAddress = (shortCommunityAddress?: string, communityAdd
   shortCommunityAddress || (communityAddress ? getShortAddress(communityAddress) : '') || communityAddress || '';
 
 const iframeChallengeConfirmDecisions = new Map<string, 'accepted' | 'rejected'>();
+const isIosWebKitUserAgent = () => {
+  if (typeof navigator === 'undefined') return false;
+  return /iPad|iPhone|iPod/.test(navigator.userAgent) || (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1);
+};
+
+const isDesktopSafariUserAgent = () => {
+  if (typeof navigator === 'undefined') return false;
+  const isAppleVendor = navigator.vendor === 'Apple Computer, Inc.';
+  const isSafari = /Safari/.test(navigator.userAgent);
+  const isOtherBrowser = /Chrome|Chromium|CriOS|FxiOS|Edg|OPR|SamsungBrowser/.test(navigator.userAgent);
+  return isAppleVendor && isSafari && !isOtherBrowser;
+};
+
+const shouldUseInlineIframeConfirm = () => {
+  const platform = Capacitor.getPlatform();
+  return platform === 'android' || platform === 'ios' || isIosWebKitUserAgent() || isDesktopSafariUserAgent();
+};
 
 const TextChallenge = ({ challenge }: { challenge: string }) => <div className={styles.challengeMedia}>{challenge}</div>;
 
@@ -112,17 +130,34 @@ interface IframeChallengeProps {
   challenge: string;
   confirmKey: string;
   confirmMessage: string;
+  inlineConfirm: boolean;
   onCancel: () => void;
   onDone: () => void;
   onAutoComplete: (challengeAnswers: string[]) => void;
   onReady: () => void;
+  openLabel: string;
+  closeLabel: string;
 }
 
-const IframeChallenge = ({ challenge, confirmKey, confirmMessage, onCancel, onDone, onAutoComplete, onReady }: IframeChallengeProps) => {
+type IframeConfirmSource = 'native' | 'inline';
+
+const IframeChallenge = ({
+  challenge,
+  confirmKey,
+  confirmMessage,
+  inlineConfirm,
+  onCancel,
+  onDone,
+  onAutoComplete,
+  onReady,
+  openLabel,
+  closeLabel,
+}: IframeChallengeProps) => {
   const account = useAccount();
   const [theme] = useTheme();
   const [iframeUrlState, setIframeUrl] = useState('');
   const [iframeOrigin, setIframeOrigin] = useState('');
+  const [inlineErrorMessage, setInlineErrorMessage] = useState('');
   const iframeRef = useRef<HTMLIFrameElement>(null);
   const attemptedLoadRef = useRef(false);
   const mountedRef = useRef(false);
@@ -148,59 +183,78 @@ const IframeChallenge = ({ challenge, confirmKey, confirmMessage, onCancel, onDo
     [onReady],
   );
 
-  const handleLoadIframe = useCallback(() => {
-    const iframeUrl = challenge;
-    if (!iframeUrl) return;
+  const handleLoadIframe = useCallback(
+    (confirmSource: IframeConfirmSource) => {
+      const iframeUrl = challenge;
+      if (!iframeUrl) return;
 
-    const rawUserAddress = account?.author?.address?.trim();
-    const requiresUserAddress = iframeUrl.includes('{userAddress}');
-
-    if (requiresUserAddress && !rawUserAddress) {
-      alert('Error: Unable to load challenge without your address. Please sign in and try again.');
-      iframeChallengeConfirmDecisions.set(confirmKey, 'rejected');
-      onCancel();
-      return;
-    }
-
-    const encodedAddress = rawUserAddress ? encodeURIComponent(rawUserAddress) : undefined;
-    const replacedUrl = requiresUserAddress && encodedAddress ? iframeUrl.replace(/\{userAddress\}/g, encodedAddress) : iframeUrl;
-
-    const validatedUrl = validateIframeChallengeUrl(replacedUrl, theme);
-    if (validatedUrl.status === 'unsupported') {
-      alert('Error: Only HTTPS iframe challenges or localhost HTTP challenges are supported');
-      iframeChallengeConfirmDecisions.set(confirmKey, 'rejected');
-      onCancel();
-      return;
-    }
-    if (validatedUrl.status === 'invalid') {
-      console.error('Invalid iframe challenge URL', { error: validatedUrl.error });
-      alert('Error: Invalid URL for authentication challenge');
-      iframeChallengeConfirmDecisions.set(confirmKey, 'rejected');
-      onCancel();
-      return;
-    }
-    const decision = iframeChallengeConfirmDecisions.get(confirmKey);
-    if (decision === 'rejected') {
-      onCancel();
-      return;
-    }
-    if (decision !== 'accepted') {
-      if (!window.confirm(confirmMessage)) {
+      const rejectChallenge = (message: string) => {
         iframeChallengeConfirmDecisions.set(confirmKey, 'rejected');
+        if (inlineConfirm) {
+          setInlineErrorMessage(message);
+          return;
+        }
+        alert(message);
+        onCancel();
+      };
+
+      const rawUserAddress = account?.author?.address?.trim();
+      const requiresUserAddress = iframeUrl.includes('{userAddress}');
+
+      if (requiresUserAddress && !rawUserAddress) {
+        rejectChallenge('Error: Unable to load challenge without your address. Please sign in and try again.');
+        return;
+      }
+
+      const encodedAddress = rawUserAddress ? encodeURIComponent(rawUserAddress) : undefined;
+      const replacedUrl = requiresUserAddress && encodedAddress ? iframeUrl.replace(/\{userAddress\}/g, encodedAddress) : iframeUrl;
+
+      const validatedUrl = validateIframeChallengeUrl(replacedUrl, theme);
+      if (validatedUrl.status === 'unsupported') {
+        rejectChallenge('Error: Only HTTPS iframe challenges or localhost HTTP challenges are supported');
+        return;
+      }
+      if (validatedUrl.status === 'invalid') {
+        console.error('Invalid iframe challenge URL', { error: validatedUrl.error });
+        rejectChallenge('Error: Invalid URL for authentication challenge');
+        return;
+      }
+      const decision = iframeChallengeConfirmDecisions.get(confirmKey);
+      if (decision === 'rejected') {
         onCancel();
         return;
       }
-      iframeChallengeConfirmDecisions.set(confirmKey, 'accepted');
-    }
-    openValidatedIframe(validatedUrl);
-  }, [account, challenge, confirmKey, confirmMessage, onCancel, openValidatedIframe, theme]);
+      if (decision !== 'accepted') {
+        if (confirmSource === 'native' && !window.confirm(confirmMessage)) {
+          iframeChallengeConfirmDecisions.set(confirmKey, 'rejected');
+          onCancel();
+          return;
+        }
+        iframeChallengeConfirmDecisions.set(confirmKey, 'accepted');
+      }
+      openValidatedIframe(validatedUrl);
+    },
+    [account, challenge, confirmKey, confirmMessage, inlineConfirm, onCancel, openValidatedIframe, theme],
+  );
 
   useEffect(() => {
+    if (inlineConfirm) return;
     if (attemptedLoadRef.current) return;
     attemptedLoadRef.current = true;
-    handleLoadIframe();
+    handleLoadIframe('native');
+  }, [handleLoadIframe, inlineConfirm]);
+
+  const handleInlineConfirm = useCallback(() => {
+    if (attemptedLoadRef.current) return;
+    attemptedLoadRef.current = true;
+    handleLoadIframe('inline');
   }, [handleLoadIframe]);
 
+  const handleInlineCancel = useCallback(() => {
+    iframeChallengeConfirmDecisions.set(confirmKey, 'rejected');
+    onCancel();
+  }, [confirmKey, onCancel]);
+
   const sendThemeToIframe = useCallback(() => {
     postThemeToIframe(iframeRef.current, iframeOrigin, theme);
   }, [iframeOrigin, theme]);
@@ -240,6 +294,27 @@ const IframeChallenge = ({ challenge, confirmKey, confirmMessage, onCancel, onDo
   }, [expectedSessionId, iframeOrigin, onAutoComplete]);
 
   if (!iframeUrlState) {
+    if (inlineConfirm) {
+      return (
+        <>
+          <div className={`${styles.challengeMediaWrapper} ${styles.iframeConsentWrapper}`}>
+            <div className={styles.iframeConsentMessage}>{inlineErrorMessage || confirmMessage}</div>
+          </div>
+          <div className={`${styles.challengeFooter} ${styles.iframeFooter}`}>
+            <span>
+              {!inlineErrorMessage && (
+                <button type='button' onClick={handleInlineConfirm}>
+                  {openLabel}
+                </button>
+              )}
+              <button type='button' onClick={handleInlineCancel}>
+                {closeLabel}
+              </button>
+            </span>
+          </div>
+        </>
+      );
+    }
     return null;
   }
 
@@ -298,7 +373,8 @@ const Challenge = ({ challenge, challengeId, closeModal, abandonModal }: Challen
   const isTextChallenge = currentChallenge?.type === 'text/plain';
   const isImageChallenge = currentChallenge?.type === 'image/png';
   const isIframeChallenge = currentChallenge?.type === 'url/iframe';
-  const isIframePending = isIframeChallenge && readyIframeChallengeKey !== iframeChallengeKey;
+  const inlineIframeConfirm = isIframeChallenge && shouldUseInlineIframeConfirm();
+  const isIframePending = isIframeChallenge && !inlineIframeConfirm && readyIframeChallengeKey !== iframeChallengeKey;
 
   useEffect(() => {
     inputRef.current?.focus();
@@ -463,10 +539,13 @@ const Challenge = ({ challenge, challengeId, closeModal, abandonModal }: Challen
             challenge={currentChallenge?.challenge ?? ''}
             confirmKey={iframeChallengeKey}
             confirmMessage={iframeConfirmMessage}
+            inlineConfirm={inlineIframeConfirm}
             onCancel={abandonModal}
             onDone={onIframeDone}
             onAutoComplete={onIframeAutoComplete}
             onReady={onIframeReady}
+            openLabel={capitalize(t('open'))}
+            closeLabel={t('close')}
           />
         ) : (
           <>