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ScreenZen vs Curbox: catalog facts
ScreenZen	Curbox
Free Free with no subscription, supported by donations.	Free Free and open source under the GPL 3.0 or later.
Android, iOS	Android
No subscription Blocks both apps and websites	Blocks Reels and Shorts without blocking the whole app Wide choice of unlock challenges, including NFC and QR codes
Closed source Phone only	Android only Self-imposed limits can still be worked around by a determined user
Downloadable app	Downloadable app
Closed source	Open source
License not stated	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.