diff --git a/apps/web/src/app/App.tsx b/apps/web/src/app/App.tsx
index 84f788c4..39a70cbe 100644
--- a/apps/web/src/app/App.tsx
+++ b/apps/web/src/app/App.tsx
@@ -1,6 +1,7 @@
 import { lazy, Suspense, useEffect } from "react";
 import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
 import { Navigate, Route, Routes, useNavigate } from "react-router";
+import { PwaUpdateNotice } from "@/components/PwaUpdateNotice";
 import { api } from "@/lib/api";
 import { EVERNOTE_MIGRATION_PATH } from "@/lib/routes";
 import type { AuthSession } from "@edgeever/shared";
@@ -111,10 +112,13 @@ const AuthenticatedWorkspace = () => {
 };
 
 export const App = () => (
-  <Routes>
-    <Route path={EVERNOTE_MIGRATION_PATH} element={<EvernoteMigrationRoute />} />
-    <Route path="/" element={<AuthenticatedWorkspace />} />
-    <Route path="/settings" element={<AuthenticatedWorkspace />} />
-    <Route path="*" element={<Navigate to="/" replace />} />
-  </Routes>
+  <>
+    <Routes>
+      <Route path={EVERNOTE_MIGRATION_PATH} element={<EvernoteMigrationRoute />} />
+      <Route path="/" element={<AuthenticatedWorkspace />} />
+      <Route path="/settings" element={<AuthenticatedWorkspace />} />
+      <Route path="*" element={<Navigate to="/" replace />} />
+    </Routes>
+    <PwaUpdateNotice />
+  </>
 );
diff --git a/apps/web/src/components/PwaUpdateNotice.tsx b/apps/web/src/components/PwaUpdateNotice.tsx
new file mode 100644
index 00000000..761a1322
--- /dev/null
+++ b/apps/web/src/components/PwaUpdateNotice.tsx
@@ -0,0 +1,147 @@
+import { useEffect, useMemo, useState } from "react";
+import { CheckCircle2, RefreshCw, X } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { cn } from "@/lib/utils";
+import {
+  consumePwaUpdateReloadPending,
+  PWA_UPDATE_NOTICE_EVENT,
+  type PwaUpdateNoticeEvent,
+  type PwaUpdateNoticeKind,
+} from "@/lib/pwa-update-notice";
+
+type Notice = {
+  id: number;
+  kind: PwaUpdateNoticeKind;
+};
+
+const isStandaloneApp = () =>
+  window.matchMedia("(display-mode: standalone)").matches ||
+  window.matchMedia("(display-mode: fullscreen)").matches ||
+  Boolean((navigator as Navigator & { standalone?: boolean }).standalone);
+
+const isDesktopViewport = () => window.matchMedia("(min-width: 1024px)").matches;
+
+const getDisplayMode = () => {
+  const isStandalone = isStandaloneApp();
+
+  return {
+    isDesktop: isDesktopViewport(),
+    visible: isStandalone,
+  };
+};
+
+const watchDisplayMode = (onChange: () => void) => {
+  const mediaQueries = [
+    window.matchMedia("(display-mode: standalone)"),
+    window.matchMedia("(display-mode: fullscreen)"),
+    window.matchMedia("(min-width: 1024px)"),
+  ];
+
+  for (const query of mediaQueries) {
+    query.addEventListener("change", onChange);
+  }
+
+  return () => {
+    for (const query of mediaQueries) {
+      query.removeEventListener("change", onChange);
+    }
+  };
+};
+
+const noticeCopy: Record<PwaUpdateNoticeKind, { title: string; description: string }> = {
+  checking: {
+    title: "发现新版本",
+    description: "正在应用更新，稍后会自动刷新。",
+  },
+  updated: {
+    title: "EdgeEver 已更新",
+    description: "当前 PWA 已是最新版本。",
+  },
+  "reload-required": {
+    title: "新版本已就绪",
+    description: "刷新后即可使用最新功能。",
+  },
+};
+
+export const PwaUpdateNotice = () => {
+  const [displayMode, setDisplayMode] = useState(() => getDisplayMode());
+  const [notice, setNotice] = useState<Notice | null>(null);
+
+  useEffect(() => {
+    const syncDisplayMode = () => setDisplayMode(getDisplayMode());
+    return watchDisplayMode(syncDisplayMode);
+  }, []);
+
+  useEffect(() => {
+    if (consumePwaUpdateReloadPending()) {
+      setNotice({ id: Date.now(), kind: "updated" });
+    }
+
+    const handleNotice = (event: Event) => {
+      const { kind } = (event as PwaUpdateNoticeEvent).detail;
+      setNotice({ id: Date.now(), kind });
+    };
+
+    window.addEventListener(PWA_UPDATE_NOTICE_EVENT, handleNotice);
+    return () => window.removeEventListener(PWA_UPDATE_NOTICE_EVENT, handleNotice);
+  }, []);
+
+  useEffect(() => {
+    if (!notice) {
+      return;
+    }
+
+    const timeout = window.setTimeout(() => setNotice(null), 8_000);
+    return () => window.clearTimeout(timeout);
+  }, [notice]);
+
+  const copy = useMemo(() => (notice ? noticeCopy[notice.kind] : null), [notice]);
+
+  if (!displayMode.visible || !notice || !copy) {
+    return null;
+  }
+
+  const isReloadRequired = notice.kind === "reload-required";
+
+  return (
+    <div
+      className={cn(
+        "fixed z-[80] max-w-[calc(100vw-2rem)] rounded-lg border border-slate-200 bg-white/95 p-3 text-slate-900 shadow-[0_18px_48px_rgba(15,23,42,0.16)] backdrop-blur",
+        displayMode.isDesktop
+          ? "right-5 top-5 w-[22rem]"
+          : "inset-x-4 bottom-[calc(4rem+env(safe-area-inset-bottom))]"
+      )}
+      role="status"
+      aria-live="polite"
+    >
+      <div className="flex items-start gap-3">
+        <div
+          className={cn(
+            "mt-0.5 flex h-8 w-8 shrink-0 items-center justify-center rounded-full",
+            notice.kind === "updated" ? "bg-emerald-50 text-emerald-600" : "bg-slate-100 text-slate-600"
+          )}
+          aria-hidden="true"
+        >
+          {notice.kind === "updated" ? <CheckCircle2 className="h-4 w-4" /> : <RefreshCw className="h-4 w-4" />}
+        </div>
+        <div className="min-w-0 flex-1">
+          <div className="text-sm font-semibold leading-5">{copy.title}</div>
+          <div className="mt-0.5 text-xs leading-5 text-slate-500">{copy.description}</div>
+          {isReloadRequired ? (
+            <Button className="mt-2" size="sm" variant="solid" onClick={() => window.location.reload()}>
+              立即刷新
+            </Button>
+          ) : null}
+        </div>
+        <button
+          className="flex h-7 w-7 shrink-0 items-center justify-center rounded-md text-slate-400 transition hover:bg-slate-100 hover:text-slate-700"
+          type="button"
+          aria-label="关闭更新通知"
+          onClick={() => setNotice(null)}
+        >
+          <X className="h-4 w-4" />
+        </button>
+      </div>
+    </div>
+  );
+};
diff --git a/apps/web/src/lib/pwa-update-notice.ts b/apps/web/src/lib/pwa-update-notice.ts
new file mode 100644
index 00000000..6a5dba15
--- /dev/null
+++ b/apps/web/src/lib/pwa-update-notice.ts
@@ -0,0 +1,33 @@
+export const PWA_UPDATE_NOTICE_EVENT = "edgeever:pwa-update-notice";
+
+const PWA_UPDATE_RELOADED_AT_KEY = "edgeever:pwa-update-reloaded-at";
+
+export type PwaUpdateNoticeKind = "checking" | "updated" | "reload-required";
+
+export type PwaUpdateNoticeDetail = {
+  kind: PwaUpdateNoticeKind;
+};
+
+export type PwaUpdateNoticeEvent = CustomEvent<PwaUpdateNoticeDetail>;
+
+export const emitPwaUpdateNotice = (detail: PwaUpdateNoticeDetail) => {
+  window.dispatchEvent(new CustomEvent<PwaUpdateNoticeDetail>(PWA_UPDATE_NOTICE_EVENT, { detail }));
+};
+
+export const markPwaUpdateReloadPending = () => {
+  try {
+    window.sessionStorage.setItem(PWA_UPDATE_RELOADED_AT_KEY, String(Date.now()));
+  } catch {
+    // Storage can be unavailable in restricted browsing modes.
+  }
+};
+
+export const consumePwaUpdateReloadPending = () => {
+  try {
+    const value = window.sessionStorage.getItem(PWA_UPDATE_RELOADED_AT_KEY);
+    window.sessionStorage.removeItem(PWA_UPDATE_RELOADED_AT_KEY);
+    return Boolean(value);
+  } catch {
+    return false;
+  }
+};
diff --git a/apps/web/src/main.tsx b/apps/web/src/main.tsx
index de4250d9..2ecbc3a2 100644
--- a/apps/web/src/main.tsx
+++ b/apps/web/src/main.tsx
@@ -4,9 +4,42 @@ import { createRoot } from "react-dom/client";
 import { BrowserRouter } from "react-router";
 import { registerSW } from "virtual:pwa-register";
 import { App } from "./app/App";
+import { emitPwaUpdateNotice, markPwaUpdateReloadPending } from "./lib/pwa-update-notice";
 import "./styles/globals.css";
 
-registerSW({ immediate: true });
+const PWA_UPDATE_CHECK_INTERVAL_MS = 10 * 60 * 1_000;
+
+let updateServiceWorker: ReturnType<typeof registerSW>;
+
+updateServiceWorker = registerSW({
+  immediate: true,
+  onNeedRefresh() {
+    emitPwaUpdateNotice({ kind: "checking" });
+    void updateServiceWorker(true);
+  },
+  onNeedReload() {
+    markPwaUpdateReloadPending();
+    window.location.reload();
+  },
+  onRegisteredSW(_swScriptUrl, registration) {
+    if (!registration) {
+      return;
+    }
+
+    const checkForUpdate = () => {
+      if (document.visibilityState === "visible") {
+        void registration.update().catch(() => undefined);
+      }
+    };
+
+    const updateInterval = window.setInterval(checkForUpdate, PWA_UPDATE_CHECK_INTERVAL_MS);
+    window.addEventListener("beforeunload", () => window.clearInterval(updateInterval), { once: true });
+    document.addEventListener("visibilitychange", checkForUpdate);
+  },
+  onRegisterError(error) {
+    console.warn("PWA service worker registration failed", error);
+  },
+});
 
 const queryClient = new QueryClient({
   defaultOptions: {