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Curbox vs ScreenZen: catalog facts
Curbox	ScreenZen
Free Free and open source under the GPL 3.0 or later.	Free Free with no subscription, supported by donations.
Android	Android, iOS
Blocks Reels and Shorts without blocking the whole app Wide choice of unlock challenges, including NFC and QR codes	No subscription Blocks both apps and websites
Android only Self-imposed limits can still be worked around by a determined user	Closed source Phone only
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	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.