What’s new
- Opening a blocked app in split screen now brings the challenge back full screen
- Calculators are blocked only while a challenge is on screen, not all the time
Quick answer
PlugBrain blocks apps and uses math challenges to reduce screen time.
F-Droid repository metadata
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 ;)
Screenshots
How to install
- Download the APK from the button at the top of this page.
- Allow “Install unknown apps” for your browser or file manager only, not for every app.
- Open the downloaded file and confirm the installation.
- If installation fails with “App not installed,” remove an earlier build of the same app first. A signature conflict is the usual cause.
Data safety
- Every file is checked against its published SHA-256 before it is listed.
- Files are scanned for malware on every update.
- The permissions each app requests are listed on its own page.
- Read the full safety policy for how we test, flag, and delist files.
Frequently asked questions
What is PlugBrain?
PlugBrain blocks apps and uses math challenges to reduce screen time.
Who develops PlugBrain?
PlugBrain is developed by Mohammed-Said Belaid.
Which Android version does PlugBrain require?
PlugBrain requires Android API 28 or later.
What is the current version of PlugBrain?
The synchronized F-Droid version is 1.6.3.
Which license does PlugBrain use?
The signed F-Droid metadata lists GPL-3.0-only.
Where is the source code for PlugBrain?
https://github.com/msbelaid/PlugBrain
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