PlugBrain blocks apps and uses math challenges to reduce screen time.
About this app
PlugBrain is an app that encourages regular breaks from distracting apps by blocking access at scheduled intervals. To regain access, you’ll need to solve a math challenge that adjusts in difficulty: the more frequently you use the apps, the harder the challenges become, but the longer you stay away, the easier they get.
**Features**
- No ads - No internet required - Blocks distracting apps - Unblock apps by solving math challenges - Difficulty increases with frequent use, decreases with focus
**How to use**
- Grant all required permissions - Select distracting apps - Choose your focus interval - Stay focused ;)
Licensed under GPL-3.0-only, by Mohammed-Said Belaid.
What's New in v1.5.4
Imported from the F-Droid repository index.
Version history
Nov 17, 2025 · 4.3 MB · Android API 28–35 · code 154
Imported from the F-Droid repository index.
SHA-256 5b5f17c53b03140826147535c0c9e93a9bb75cf6b09856c5e2ec8347a21b7db4
Oct 7, 2025 · 4.2 MB · Android API 28–35 · code 153
Imported from the F-Droid repository index.
SHA-256 4b759e9b90abf9ddb1d9122d28eb6478465f562ea512c1d661773d1737bb9dd1
Oct 2, 2025 · 4.2 MB · Android API 28–35 · code 152
Imported from the F-Droid repository index.
SHA-256 ee50efd45d7eb0f71fffa535172d9a5d9eb7beb98977d69c92b2ed231e6753ea
Will it run on your device?
74%
- Targets newer Android builds, so legacy devices may be excluded.
- Multiple CPU architectures are covered.
- Aligned with the latest Android target SDK expectations.
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 app.plugbrain.android 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, 1.5.3 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall PlugBrain 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 PlugBrain, and a listing is removed when the evidence for it stops holding up.
Get PlugBrain
Every source we list for app.plugbrain.android 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
5b5f17c53b03140826147535c0c9e93a9bb75cf6b09856c5e2ec8347a21b7db4
Signing certificate
776dfaa24e8316225bd4a1caa00cfdfdd87beb17571e5b3469cfdb92453d4ba9
Permissions Required
What each permission lets PlugBrain 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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