Capabilities
Everything you need. Nothing you don't.
SentryLens runs a lightweight server directly on your Android device, turning any spare phone into a full-featured local network security camera — with no subscription, no cloud, and no third-party app required to view the feed.
Live H.264 Streaming
Hardware-encoded H.264 video at up to 4K / 60fps, delivered over your local Wi-Fi to any browser — no plugin needed.
On-Device AI Detection
Google ML Kit image labeling and pose detection run entirely on your device. No camera frames are sent to any external server.
Event Catalog
Every detection triggers a full-resolution snapshot and thumbnail saved to your device. Browse, review, and export from the web dashboard.
MJPEG Fallback
Automatic MJPEG stream at 720p for older browsers, smart TVs, or any device that can't play H.264 directly.
mDNS Auto-Discovery
Your camera advertises itself via mDNS — reach it at
cameraname.local without looking up the IP address.ZIP Export
Download your entire event log as a ZIP archive: a timestamped CSV index plus all full-resolution detection snapshots.
Battery Monitor
The web dashboard shows real-time battery level and charging status — always know when to plug in your camera phone.
Configurable
Set a custom camera name, HTTP port, and stream quality (720p / 1080p / 1440p / 4K). All settings persist across restarts.
Detection Filters
Choose which objects trigger events. Multi-frame confirmation cuts false positives.
All Movement
People
Pets
Cat
Dog
Car / Vehicle
Package
Wildlife
Privacy
Your network. Your data. Full stop.
SentryLens makes zero outbound internet connections. There is no backend, no account, no analytics SDK, and no data ever leaves your local network.
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Local Network Only
The live stream and event catalog are only reachable on your Wi-Fi. No port-forwarding, no cloud relay.
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No Uploads
Snapshots stay in the app's private on-device storage and are never transmitted anywhere.
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On-Device AI
ML Kit runs locally. Camera frames are never sent to Google or any external service for detection.
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No Ads or Accounts
No advertising SDKs, crash reporters, analytics trackers, or sign-up of any kind.
Permissions Required
CAMERA
FOREGROUND_SERVICE
FOREGROUND_SERVICE_CAMERA
INTERNET
ACCESS_WIFI_STATE
CHANGE_WIFI_MULTICAST_STATE
WAKE_LOCK
POST_NOTIFICATIONS
ACCESS_NETWORK_STATE
RECEIVE_BOOT_COMPLETED
RECEIVE_BOOT_COMPLETED lets the camera service resume automatically after the device restarts, so an unattended camera comes back on its own after a power cut.
Setup
Up and running in minutes
1
Download & Install
Download the APK to your Android device, enable Install from Unknown Sources in Settings → Apps → Special app access, then open the file to install.
2
Grant Camera Permission
Open SentryLens and allow camera access when prompted. The streaming service starts automatically and shows a persistent notification.
3
Open the Dashboard
The app displays your local IP and port (default
:4747). Open that URL in any browser on the same Wi-Fi to view the live stream and event log. In 1.2, use the dashboard rather than reopening the app from the launcher while the service is already running.SentryLens
Free · Android 8.0+ · v1.2 · No ads · No account
Android 8.0 (Oreo) or newer
Rear-facing camera required
Wi-Fi for remote dashboard access
~200 MB free storage recommended
Sideloading required. This APK is not on Google Play.
Enable Install from Unknown Sources in Android Settings → Apps
→ Special app access, then open the downloaded file to install.
The build is universal, so it covers every device architecture, which is why
it is large.