Facial recognition surveillance with alerts
About this app
Sentinel Lens is a facial recognition surveillance app that uses your Android device's camera to record video in the background (with no live preview) and sends Telegram alerts when unauthorized individuals are detected, based on a configurable blacklist and whitelist.
Key Features
Background Recording
• Discreet Capture: Record video silently in the background without any visible camera preview.
• Saved Camera Footage: Automatically store recordings for later review.
• Front or Back Camera: Choose either camera lens for optimal coverage.
Advanced Facial Recognition
• Facial Recognition Surveillance: Analyze recorded frames to identify known and unknown faces.
• Configurable Watchlist: Maintain custom blacklist and whitelist entries to control alerts.
Real-Time Alerts
• Telegram Alert Integration: Send instant notifications via Telegram when a watchlist match is detected.
Licensed under GPL-3.0-only.
What's New in v1.0.2
Imported from the F-Droid repository index.
Version history
Oct 7, 2025 · 94.1 MB · Android API 30–34 · code 3
Imported from the F-Droid repository index.
SHA-256 cf3d3759c8a8a8791be78e5745123d06953c78c6fb6204602a59089dba2fc088
May 2, 2025 · 96.5 MB · Android API 30–34 · code 2
Imported from the F-Droid repository index.
SHA-256 c8e4ed89b0993640416d9ba7aa801e4566261448016f94e404b25698e8287623
Apr 22, 2025 · 96.5 MB · Android API 30–34 · code 1
Imported from the F-Droid repository index.
SHA-256 28aedfee5671635f1c1f3b0c6eedb3cacc48ece2cb26da5f8fb3684a07e12ee4
Will it run on your device?
69%
- Targets newer Android builds, so legacy devices may be excluded.
- Multiple CPU architectures are covered.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be com.fpf.sentinellens is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 1.0.1 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Sentinel Lens first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Sentinel Lens, and a listing is removed when the evidence for it stops holding up.
Get Sentinel Lens
Every source we list for com.fpf.sentinellens is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
cf3d3759c8a8a8791be78e5745123d06953c78c6fb6204602a59089dba2fc088
Signing certificate
56d6cba6156aa01e26852ce4e3c6c6fc439dae35c58cc20b40f21a379e10e928
Permissions Required
What each permission lets Sentinel Lens do. A highlighted one is worth a second look — not necessarily wrong, just worth asking whether this app needs it.
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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