diff --git a/app/web/app.js b/app/web/app.js
index 1f25420..9590c64 100644
--- a/app/web/app.js
+++ b/app/web/app.js
@@ -201,21 +201,39 @@ let recChunks = [];
 
 async function startRecording() {
   if (busy) return;
+  const md = navigator.mediaDevices;
+  if (!md || !md.getUserMedia) {
+    addMessage("system", "Mikrofon nicht freigegeben: Bitte die Seite direkt in Safari öffnen (nicht im In-App-Browser) und keinen Privat-Modus verwenden.");
+    return;
+  }
+  if (typeof MediaRecorder === "undefined") {
+    addMessage("system", "Aufnahme nicht unterstützt (iOS < 14.3?). Bitte iOS aktualisieren.");
+    return;
+  }
   let stream;
   try {
-    stream = await navigator.mediaDevices.getUserMedia({ audio: true });
+    stream = await md.getUserMedia({ audio: true });
   } catch (e) {
-    addMessage("system", "Mikrofon nicht verfuegbar (HTTPS noetig?). " + e.message);
+    addMessage("system", "Mikrofon-Zugriff fehlgeschlagen: " + (e.name || "") +
+      ". Tipp: iPhone → Einstellungen → Safari → Mikrofon = Erlauben/Fragen.");
     return;
   }
   recChunks = [];
-  mediaRecorder = new MediaRecorder(stream);
+  try {
+    mediaRecorder = new MediaRecorder(stream);
+  } catch (e) {
+    stream.getTracks().forEach((t) => t.stop());
+    addMessage("system", "Aufnahme nicht möglich: " + (e.name || e.message));
+    return;
+  }
   mediaRecorder.ondataavailable = (e) => { if (e.data.size) recChunks.push(e.data); };
   mediaRecorder.onstop = async () => {
     stream.getTracks().forEach((t) => t.stop());
-    const blob = new Blob(recChunks, { type: mediaRecorder.mimeType || "audio/webm" });
+    const mime = mediaRecorder.mimeType || "audio/mp4";
+    const blob = new Blob(recChunks, { type: mime });
     const bytes = await blob.arrayBuffer();
-    sendVoice(bytes);
+    // Safari -> audio/mp4, andere -> webm; der Server erkennt das Format am Inhalt.
+    sendVoice(bytes, mime.includes("mp4") || mime.includes("mpeg") ? "mp4" : "webm");
   };
   mediaRecorder.start();
   micBtn.classList.remove("bg-emerald-600");
@@ -229,13 +247,13 @@ function stopRecording() {
   micBtn.classList.add("bg-emerald-600");
 }
 
-async function sendVoice(bytes) {
+async function sendVoice(bytes, fmt = "webm") {
   if (busy) return;
   busy = true;
   await ensureSession();
   statusEl.textContent = "verarbeite Sprache …";
   await runTurn("/ws/voice", (ws) => {
-    ws.send(JSON.stringify({ type: "start", format: "webm", stream: true, audio_stream: true, ...overrides() }));
+    ws.send(JSON.stringify({ type: "start", format: fmt, stream: true, audio_stream: true, ...overrides() }));
     ws.send(bytes);
     ws.send(JSON.stringify({ type: "end" }));
   });
diff --git a/app/web/index.html b/app/web/index.html
index e5c31a8..72af00c 100644
--- a/app/web/index.html
+++ b/app/web/index.html
@@ -60,6 +60,6 @@
     <div id="status" class="w-full max-w-3xl mx-auto mt-1 min-h-[1rem] text-xs text-slate-500 dark:text-slate-400"></div>
   </footer>
 
-  <script src="/app.js?v=6"></script>
+  <script src="/app.js?v=7"></script>
 </body>
 </html>