# Sentry (open-source security app)

> Sentry is a free, open-source security app for Android. Enforce security policies. It has 161 GitHub stars and is released under the GPL-3.0-only license, and you can install it from F-Droid.

Tiny app to enforce security policies of your device. It can: * limit the maximum number of failed password attempts * disable USB data connections (Android 12, USB HAL 1.3, Device Owner) * disable safe boot mode (Android 7, Device Owner) * notify on failed password attempt * notify when an app without Internet permission got it after an update Be aware that the app may not work in safe mode. Permissions: * DEVICEADMIN - limit the maximum number of failed password attempts DEVICEOWNER - disable USB data connections NOTIFICATIONLISTENER - receive lock/package events QUERYALLPACKAGES - receive all package events It is Free Open Source Software. License: GPL-3

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/x13a/Sentry |
| Platforms | Android |
| Built with | Kotlin |
| GitHub stars | 161 |
| License | GPL-3.0-only (open source) |
| F-Droid | https://f-droid.org/packages/me.lucky.sentry/ (package me.lucky.sentry) |
| F-Droid anti-features | none flagged |
| Google Play | not linked |
| App Store | not linked |
| Website | none listed |
| Official | no |
| Category | Password managers & security |
| Latest release | v1.1.2 (Sep 19, 2022) |
| Last commit | Sep 22, 2026 |

F-Droid builds its apps from source and flags anti-features: https://f-droid.org/en/docs/Anti-Features/

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