diff --git a/apps/web/app/composables/useDocsUrl.ts b/apps/web/app/composables/useDocsUrl.ts
new file mode 100644
index 0000000..c9f2b64
--- /dev/null
+++ b/apps/web/app/composables/useDocsUrl.ts
@@ -0,0 +1,11 @@
+export function useDocsUrl() {
+  const url = shallowRef("http://localhost:3001")
+
+  onMounted(() => {
+    const { protocol, hostname } = window.location
+    if (hostname === "localhost" || hostname === "127.0.0.1") url.value = "http://localhost:3001"
+    else url.value = `${protocol}//docs.${hostname}`
+  })
+
+  return url
+}