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PlugBrain vs ScreenZen: catalog facts
PlugBrain	ScreenZen
Free Free and open source under the GPL-3.0 licence.	Free Free with no subscription, supported by donations.
Android	Android, iOS
Math challenges add friction instead of a hard block Difficulty adapts to how often you open the apps	No subscription Blocks both apps and websites
Android only No releases published on the GitHub repository	Closed source Phone only
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.