diff --git a/src/voice.rs b/src/voice.rs
index e327d7a..4ea9825 100644
--- a/src/voice.rs
+++ b/src/voice.rs
@@ -18,6 +18,7 @@ struct ClientHandle {
     display_name: String,
     is_sharing_video: bool,
     is_sharing_screen: bool,
+    is_speaking: bool,
     tx: mpsc::UnboundedSender<ServerEvent>,
 }
 
@@ -27,6 +28,7 @@ pub struct VoiceParticipant {
     pub display_name: String,
     pub is_sharing_video: bool,
     pub is_sharing_screen: bool,
+    pub is_speaking: bool,
 }
 
 #[derive(Serialize, Clone)]
@@ -50,6 +52,10 @@ enum ServerEvent {
         user_id: Uuid,
         is_sharing_screen: bool,
     },
+    SpeakingStatusChanged {
+        user_id: Uuid,
+        is_speaking: bool,
+    },
     Signal {
         from_user_id: Uuid,
         kind: String,
@@ -74,6 +80,9 @@ enum ClientEvent {
     SetScreenStatus {
         is_sharing_screen: bool,
     },
+    SetSpeakingStatus {
+        is_speaking: bool,
+    },
 }
 
 impl VoiceHub {
@@ -89,6 +98,7 @@ impl VoiceHub {
                 display_name: handle.display_name.clone(),
                 is_sharing_video: handle.is_sharing_video,
                 is_sharing_screen: handle.is_sharing_screen,
+                is_speaking: handle.is_speaking,
             })
             .collect()
     }
@@ -110,6 +120,7 @@ impl VoiceHub {
                 display_name: peer.display_name.clone(),
                 is_sharing_video: peer.is_sharing_video,
                 is_sharing_screen: peer.is_sharing_screen,
+                is_speaking: peer.is_speaking,
             })
             .collect::<Vec<_>>();
 
@@ -119,6 +130,7 @@ impl VoiceHub {
                 display_name: display_name.clone(),
                 is_sharing_video: false,
                 is_sharing_screen: false,
+                is_speaking: false,
                 tx,
             },
         );
@@ -213,6 +225,26 @@ impl VoiceHub {
             }
         }
     }
+
+    pub async fn set_speaking_status(&self, room_id: Uuid, user_id: Uuid, is_speaking: bool) {
+        let mut rooms = self.rooms.write().await;
+        let Some(room) = rooms.get_mut(&room_id) else {
+            return;
+        };
+
+        if let Some(handle) = room.get_mut(&user_id) {
+            handle.is_speaking = is_speaking;
+
+            for (peer_id, peer) in room.iter() {
+                if *peer_id != user_id {
+                    let _ = peer.tx.send(ServerEvent::SpeakingStatusChanged {
+                        user_id,
+                        is_speaking,
+                    });
+                }
+            }
+        }
+    }
 }
 
 pub async fn handle_socket(state: AppState, socket: WebSocket, room_id: Uuid, user_id: Uuid) {
@@ -267,6 +299,12 @@ pub async fn handle_socket(state: AppState, socket: WebSocket, room_id: Uuid, us
                             .set_screen_status(room_id, user_id, is_sharing_screen)
                             .await;
                     }
+                    Ok(ClientEvent::SetSpeakingStatus { is_speaking }) => {
+                        state
+                            .voice
+                            .set_speaking_status(room_id, user_id, is_speaking)
+                            .await;
+                    }
                     Err(err) => {
                         let _ = tx.send(ServerEvent::Error {
                             message: format!("invalid voice message: {err}"),
diff --git a/static/app.js b/static/app.js
index f6eaa85..8f01157 100644
--- a/static/app.js
+++ b/static/app.js
@@ -281,7 +281,7 @@ function renderChannels() {
         pList.style.paddingLeft = "24px";
         for (const p of participants) {
           const pRow = document.createElement("div");
-          pRow.className = "channel-row";
+          pRow.className = `channel-row ${p.is_speaking ? 'voice-speaking' : ''}`;
           pRow.style.padding = "2px 8px";
           pRow.innerHTML = `<div class="avatar" style="width:20px;height:20px;font-size:10px">${shortName(p.display_name)}</div> <span>${escapeHtml(p.display_name)}</span>`;
           pList.appendChild(pRow);
@@ -629,15 +629,57 @@ function renderVideo(peerId, displayName, stream, source) {
 }
 
 async function buildAudioPipeline(rawStream) {
-  const audioContext = new AudioContext();
-  const source = audioContext.createMediaStreamSource(rawStream);
-  const destination = audioContext.createMediaStreamDestination();
-  state.voice.audioContext = audioContext;
+  const ctx = new AudioContext();
+  state.voice.audioContext = ctx;
+  const source = ctx.createMediaStreamSource(rawStream);
 
-  let head = source;
+  // Metering/Speaking detection
+  const analyser = ctx.createAnalyser();
+  analyser.fftSize = 512;
+  source.connect(analyser);
 
-  head.connect(destination);
+  const dataArray = new Uint8Array(analyser.frequencyBinCount);
+  let localIsSpeaking = false;
+  let speakCounter = 0;
 
+  const checkVolume = () => {
+    if (!state.voice.audioContext || state.voice.audioContext.state === 'closed') return;
+    analyser.getByteFrequencyData(dataArray);
+    let sum = 0;
+    for (let i = 0; i < dataArray.length; i++) sum += dataArray[i];
+    const avg = sum / dataArray.length;
+
+    const isCurrentlySpeaking = avg > 30; // Calibrated for normal speech
+
+    if (isCurrentlySpeaking) {
+      speakCounter = Math.min(speakCounter + 1, 5);
+    } else {
+      speakCounter = Math.max(speakCounter - 1, 0);
+    }
+
+    const newSpeakingState = speakCounter >= 2;
+
+    if (newSpeakingState !== localIsSpeaking) {
+      localIsSpeaking = newSpeakingState;
+      if (state.voice.ws && state.voice.ws.readyState === WebSocket.OPEN) {
+        state.voice.ws.send(JSON.stringify({ type: 'set_speaking_status', is_speaking: localIsSpeaking }));
+      }
+      // Local UI update
+      state.voicePresence.get(state.selectedVoiceChannelId)?.forEach(p => {
+        if (p.user_id === state.me.id) p.is_speaking = localIsSpeaking;
+      });
+      renderChannels();
+      const myVideo = document.getElementById(`video-${state.me.id}-camera`) || document.getElementById(`video-${state.me.id}-screen`);
+      if (myVideo) {
+        myVideo.parentElement.classList.toggle('speaking', localIsSpeaking);
+      }
+    }
+    setTimeout(checkVolume, 100);
+  };
+  checkVolume();
+
+  const destination = ctx.createMediaStreamDestination();
+  source.connect(destination);
   return destination.stream;
 }
 
@@ -839,6 +881,15 @@ async function joinVoice() {
       if (!msg.is_sharing_screen) {
         document.getElementById(`video-${msg.user_id}-screen`)?.parentElement?.remove();
       }
+    } else if (msg.type === "speaking_status_changed") {
+      state.voicePresence.get(state.selectedVoiceChannelId)?.forEach(p => {
+        if (p.user_id === msg.user_id) p.is_speaking = msg.is_speaking;
+      });
+      renderChannels();
+      const videoEl = document.getElementById(`video-${msg.user_id}-camera`) || document.getElementById(`video-${msg.user_id}-screen`);
+      if (videoEl) {
+        videoEl.parentElement.classList.toggle('speaking', msg.is_speaking);
+      }
     }
     refreshVoicePresence().catch(() => { });
   };
diff --git a/static/styles.css b/static/styles.css
index 3077a78..c0b681a 100644
--- a/static/styles.css
+++ b/static/styles.css
@@ -566,6 +566,19 @@ select {
   font-size: 12px;
 }
 
+/* Voice Activity */
+.voice-speaking .avatar {
+  box-shadow: 0 0 0 2px var(--green);
+}
+
+.video-item.speaking {
+  box-shadow: 0 0 0 4px var(--green);
+}
+
+.video-item.speaking .video-label {
+  background: var(--green);
+}
+
 /* Chat Pane */
 .chat-pane {
   display: flex;