diff --git a/public/app.js b/public/app.js
index 2afb453..4049a0f 100644
--- a/public/app.js
+++ b/public/app.js
@@ -2000,11 +2000,17 @@ const initApp = () => {
   const btnAnalyzeTranscription = document.getElementById('btnAnalyzeTranscription');
   const recordProcessingText = document.getElementById('recordProcessingText');
   const recordProcessingSubtext = document.getElementById('recordProcessingSubtext');
-
+// Variáveis de gravação
   let mediaRecorder = null;
   let audioChunks = [];
   let recordingStartTime = null;
   let timerInterval = null;
+  let audioContext = null;
+  let analyser = null;
+  let frequencyData = null;
+  let silenceFrames = 0;
+  let totalFrames = 0;
+  let vadCheckInterval = null;
   let generatedReport = null;
   let generatedCriancas = null;
   let generatedTurma = 'não informada';
@@ -2021,6 +2027,9 @@ const initApp = () => {
       }
     }
     clearInterval(timerInterval);
+    clearInterval(vadCheckInterval);
+    if (audioContext) { audioContext.close(); audioContext = null; }
+    if (analyser) { analyser = null; frequencyData = null; }
     audioChunks = [];
     generatedReport = null;
     recordModal.style.display = 'none';
@@ -2074,6 +2083,52 @@ const initApp = () => {
             options = { mimeType: 'audio/mp4' };
           }
         }
+        // Configurar AudioContext para VAD
+        audioContext = new AudioContext();
+        const source = audioContext.createMediaStreamSource(stream);
+        analyser = audioContext.createAnalyser();
+        analyser.fftSize = 256;
+        source.connect(analyser);
+        frequencyData = new Uint8Array(analyser.frequencyBinCount);
+
+        // Iniciar verificação de silêncio (VAD)
+        silenceFrames = 0;
+        totalFrames = 0;
+        vadCheckInterval = setInterval(() => {
+          if (!analyser) return;
+          analyser.getByteFrequencyData(frequencyData);
+          const avg = frequencyData.reduce((a, b) => a + b, 0) / frequencyData.length;
+          totalFrames++;
+          if (avg < 10) {
+            silenceFrames++;
+          } else {
+            silenceFrames = Math.max(0, silenceFrames - 2); // recupera mais rápido
+          }
+          // Atualizar indicator visual
+          const recordWaveform = document.getElementById('recordWaveform');
+          if (recordWaveform && recordWaveform.children[0]) {
+            const bars = recordWaveform.children;
+            bars.forEach((bar) => {
+              const h = Math.max(4, (avg / 255) * 50 + Math.random() * 10);
+              bar.style.height = `${h}px`;
+            });
+          }
+          // Se mais de 60% dos últimos 30 frames for silêncio, avisar
+          if (totalFrames > 30 && (silenceFrames / 30) > 0.6) {
+            const btnStopRecord = document.getElementById('btnStopRecord');
+            if (btnStopRecord && !btnStopRecord.disabled) {
+              btnStopRecord.style.borderColor = '#ff6b6b';
+              btnStopRecord.title = 'Silêncio detectado - Clique se quiser parar';
+            }
+          } else {
+            const btnStopRecord = document.getElementById('btnStopRecord');
+            if (btnStopRecord) {
+              btnStopRecord.style.borderColor = '';
+              btnStopRecord.title = '';
+            }
+          }
+        }, 100);
+
         mediaRecorder = new MediaRecorder(stream, options);
 
         mediaRecorder.ondataavailable = (e) => {
@@ -2110,6 +2165,9 @@ const initApp = () => {
         }
       }
       clearInterval(timerInterval);
+      clearInterval(vadCheckInterval);
+      if (audioContext) { audioContext.close(); audioContext = null; }
+      if (analyser) { analyser = null; frequencyData = null; }
 
       // Mostra processando com texto de transcrição
       if (recordProcessingText) recordProcessingText.textContent = 'Transcrevendo áudio...';