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Sentry

Sentry is a free, open-source security app for Android. Enforce security policies. It has 163 GitHub stars and is released under the GPL-3.0-only license, and you can install it from F-Droid.

github.com/x13a/Sentry (opens in a new tab)

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About Sentry

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

Privacy and F-Droid

F-Droid builds Sentry from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.

No anti-features flagged on the latest F-Droid build.

Screenshots

  • Sentry screenshot 1
  • Sentry screenshot 2

Screenshots from the app's F-Droid listing.

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FAQ

Sentry FAQ

Still curious? Email info@appsgit.com.

Is Sentry free and open source?

Yes. Sentry's source code is public on GitHub under the GPL-3.0-only license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.

How do I install Sentry?

You can install Sentry from F-Droid (package me.lucky.sentry); the links are on this page. Its GitHub repository also publishes releases (latest: v1.1.2).

Is Sentry still maintained?

The repository's most recent commit was on Sep 22, 2026. Its F-Droid listing was last updated on Sep 23, 2022. appsgit only lists apps whose repository had a commit in the last six months.