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Curbox vs PlugBrain: catalog facts
Curbox	PlugBrain
Free Free and open source under the GPL 3.0 or later.	Free Free and open source under the GPL-3.0 licence.
Android	Android
Blocks Reels and Shorts without blocking the whole app Wide choice of unlock challenges, including NFC and QR codes	Math challenges add friction instead of a hard block Difficulty adapts to how often you open the apps
Android only Self-imposed limits can still be worked around by a determined user	Android only No releases published on the GitHub repository
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
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.