Privacy Policy

Effective date: February 20, 2026  ·  App version 1.1

SentryLens is a local-network security camera application. This policy explains exactly what data the app accesses, how it is used, and what it never does. SentryLens does not transmit any data off your device or local network.

Permissions Used

CAMERA FOREGROUND_SERVICE FOREGROUND_SERVICE_CAMERA INTERNET ACCESS_WIFI_STATE CHANGE_WIFI_MULTICAST_STATE WAKE_LOCK POST_NOTIFICATIONS

• Camera — live camera feed is analyzed on-device for motion and object detection. No video is streamed, recorded as video, or uploaded anywhere.
• Foreground Service / Foreground Service (Camera) — required by Android to keep the camera active while the app is in the background. You will always see a persistent notification while the service is running.
• Internet / Wi-Fi state / Multicast — used solely to host a local web dashboard accessible only on your home or local network. No outbound connections are made to the internet.
• Wake Lock — keeps the processor awake while monitoring so motion events are not missed overnight.
• Post Notifications — used to display the foreground service notification and optional motion-detected alerts on your device.

Data Collected

SentryLens captures still image snapshots and thumbnails when motion is detected. This data:

• Is stored only on your device in the app's private storage directory.
• Is never uploaded to any server, cloud service, or third party.
• Is accessible only through the local-network web dashboard while the service is active.
• Is automatically pruned when total snapshot storage exceeds 1 GB (oldest files deleted first).
• Is permanently deleted when you use the "Clear Events" function or uninstall the app.

ML / On-Device Processing

Object detection (people, pets, vehicles, etc.) is performed using Google ML Kit Image Labeling, which runs entirely on-device. Camera frames are never sent to Google or any external service for this purpose. The ML Kit library itself may be subject to Google's ML Kit Terms of Service.

Local Web Dashboard

SentryLens runs a lightweight HTTP server (NanoHTTPD) on your local network so you can view the live feed and event history from a browser on the same Wi-Fi network. This server is only reachable within your local network — it does not expose any data to the public internet unless you have manually configured port forwarding on your router, which we do not recommend.

No Analytics, No Ads, No Accounts

SentryLens contains no advertising SDKs, no crash reporting services, no usage analytics, and requires no user account or registration of any kind. There is no backend service associated with this application.

Data Sharing

We do not sell, share, rent, or otherwise transfer any user data to third parties. There is no data to share — all information stays on your device.

Children's Privacy

SentryLens is not directed at children under 13. We do not knowingly collect any personal information from children.

Changes to This Policy

If this policy is updated, the revised version will be posted at this URL with an updated effective date. Continued use of the app after changes constitutes acceptance of the updated policy.

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