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PlugBrain vs Defang: catalog facts
PlugBrain	Defang
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-3.0 license.
Android	Android
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 Overridable by design rather than a hard block
Android only No releases published on the GitHub repository	Easy to bypass by design Young project with a small user base
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-only
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.