diff --git a/src/app/chat/chat-screen.tsx b/src/app/chat/chat-screen.tsx
index 06fa7182..e010fac4 100644
--- a/src/app/chat/chat-screen.tsx
+++ b/src/app/chat/chat-screen.tsx
@@ -7,10 +7,11 @@ import Image from "next/image";
 
 import { useAuthState } from "@/stores/auth/auth-context";
 import type { LoginStatus } from "@/data/dto/auth";
+import { AppStorage } from "@/data/storage/app/app_storage";
 import { AuthStorage } from "@/data/storage/auth/auth_storage";
 import { UserStorage } from "@/data/storage/user/user_storage";
 import { useChatState } from "@/stores/chat/chat-context";
-import { AppEnvUtil, BrowserDetector, UrlLauncherUtil } from "@/utils";
+import { AppEnvUtil, BrowserDetector, todayString, UrlLauncherUtil } from "@/utils";
 import { ROUTE_BUILDERS, ROUTES } from "@/router/routes";
 
 import { MobileShell } from "@/app/_components/core";
@@ -56,16 +57,36 @@ export function ChatScreen() {
 
   useEffect(() => {
     if (!authState.hasInitialized || authState.isLoading) return;
-    if (authState.loginStatus !== "facebook") return;
-    if (externalBrowserPromptShownRef.current) return;
-    if (!BrowserDetector.isInAppBrowser()) return;
+    const isDev = AppEnvUtil.isDevelopment();
+    const canTriggerPrompt =
+      isDev ||
+      (authState.loginStatus === "facebook" && BrowserDetector.isInAppBrowser());
+    if (!canTriggerPrompt) return;
 
-    externalBrowserPromptShownRef.current = true;
-    const timer = window.setTimeout(() => {
-      setShowExternalBrowserDialog(true);
-    }, 3000);
+    let mounted = true;
+    let timer: number | undefined;
 
-    return () => window.clearTimeout(timer);
+    const init = async () => {
+      if (externalBrowserPromptShownRef.current) return;
+
+      const today = todayString();
+      const canShowResult = await AppStorage.canShowExternalBrowserDialog(today);
+      if (!mounted || !canShowResult.success || !canShowResult.data) return;
+
+      externalBrowserPromptShownRef.current = true;
+      timer = window.setTimeout(() => {
+        if (!mounted) return;
+        setShowExternalBrowserDialog(true);
+        void AppStorage.recordExternalBrowserDialogShown(today);
+      }, 3000);
+    };
+
+    void init();
+
+    return () => {
+      mounted = false;
+      if (timer !== undefined) window.clearTimeout(timer);
+    };
   }, [
     authState.hasInitialized,
     authState.isLoading,
diff --git a/src/data/storage/app/app_storage.ts b/src/data/storage/app/app_storage.ts
index 5adf64e4..979c52bc 100644
--- a/src/data/storage/app/app_storage.ts
+++ b/src/data/storage/app/app_storage.ts
@@ -30,6 +30,26 @@ export class AppStorage {
     return SpAsyncUtil.setString(StorageKeys.lastPwaDialogShown, todayString);
   }
 
+  // ---- external browser dialog ----
+
+  static async canShowExternalBrowserDialog(
+    todayString: string,
+  ): Promise<ResultT<boolean>> {
+    return AppStorage.canReportKey(
+      StorageKeys.lastExternalBrowserDialogShown,
+      todayString,
+    );
+  }
+
+  static recordExternalBrowserDialogShown(
+    todayString: string,
+  ): Promise<ResultT<void>> {
+    return SpAsyncUtil.setString(
+      StorageKeys.lastExternalBrowserDialogShown,
+      todayString,
+    );
+  }
+
   // ---- PWA event reporting ----
 
   static canReportPwaEvent(todayString: string): Promise<ResultT<boolean>> {
diff --git a/src/data/storage/storage_keys.ts b/src/data/storage/storage_keys.ts
index c633fa55..f5cfb04e 100644
--- a/src/data/storage/storage_keys.ts
+++ b/src/data/storage/storage_keys.ts
@@ -26,6 +26,7 @@ export const StorageKeys = {
 
   // pwa / app info
   lastPwaDialogShown: "last_pwa_dialog_shown",
+  lastExternalBrowserDialogShown: "last_external_browser_dialog_shown",
   lastPwaEventReported: "last_pwa_event_reported",
   lastAppInfoReported: "last_app_info_reported",
 } as const;