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Curbox vs Zenwell: catalog facts
Curbox	Zenwell
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	Blocks selected apps such as Instagram or YouTube Shorts Math puzzles or breathing exercises as an unlock step
Android only Self-imposed limits can still be worked around by a determined user	Android only Determined users can still get past the challenge
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
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.