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PlugBrain vs Clearspace: catalog facts
PlugBrain	Clearspace
Free Free and open source under the GPL-3.0 licence.	Freemium Free to download; check the app stores for current plan details.
Android	Android, iOS, Browser extension
Math challenges add friction instead of a hard block Difficulty adapts to how often you open the apps	Adds a pause before opening distracting apps instead of only blocking them Available on iOS and Android
Android only No releases published on the GitHub repository	Closed source Pricing details are not stated on the homepage
Downloadable app	Downloadable app, Browser extension
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.