diff --git a/api.go b/api.go
index d107dc6..8b96def 100644
--- a/api.go
+++ b/api.go
@@ -13,6 +13,7 @@ import (
 	"net/http/httputil"
 	"net/url"
 	"os"
+	"path/filepath"
 	"strings"
 	"time"
 )
@@ -27,9 +28,19 @@ func (s *Server) handleCameras(w http.ResponseWriter, r *http.Request) {
 
 	statuses := make([]CameraStatus, 0, len(s.appConfig.Cameras))
 	for _, cam := range s.appConfig.Cameras {
+		online := false
+		// Check if latest.jpg was recently updated.
+		camDir := cam.Name
+		if camDir == "" {
+			camDir = cam.ID
+		}
+		snapFile := filepath.Join(s.appConfig.Storage.RecordingsPath, camDir, "latest.jpg")
+		if info, err := os.Stat(snapFile); err == nil {
+			online = time.Since(info.ModTime()) < 10*time.Second
+		}
 		statuses = append(statuses, CameraStatus{
 			CameraConfig: cam,
-			Online:       false, // TODO: real stream health check in M2
+			Online:       online,
 			Uptime:       "n/a",
 			Streams:      0,
 		})
@@ -56,9 +67,16 @@ func (s *Server) handleCameraByID(w http.ResponseWriter, r *http.Request) {
 
 	switch r.Method {
 	case http.MethodGet:
+		online := false
+		camDir := cam.Name
+		if camDir == "" { camDir = cam.ID }
+		snapFile := filepath.Join(s.appConfig.Storage.RecordingsPath, camDir, "latest.jpg")
+		if info, err := os.Stat(snapFile); err == nil {
+			online = time.Since(info.ModTime()) < 10*time.Second
+		}
 		status := CameraStatus{
 			CameraConfig: *cam,
-			Online:       false,
+			Online:       online,
 			Uptime:       "n/a",
 			Streams:      0,
 		}
diff --git a/public/app.js b/public/app.js
index 97b5203..1512aa3 100644
--- a/public/app.js
+++ b/public/app.js
@@ -104,7 +104,7 @@ function renderLiveGrid() {
                 <img src="${snapURL}" class="grid-snap" loading="lazy"
                      onerror="this.parentElement.classList.add('offline')"
                      style="width:100%;height:100%;object-fit:cover;position:absolute;inset:0" alt="${cam.name}">
-                <span class="tile-status online"></span>
+                <span class="tile-status ${cam.online ? 'online' : 'offline'}"></span>
                 <span class="tile-label">${cam.name}</span>
             `;
             tile.addEventListener('click', () => openFocus(cam));