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ScreenZen vs Zenwell: catalog facts
ScreenZen	Zenwell
Free Free with no subscription, supported by donations.	Free Free and open source under the GPL-3.0 licence.
Android, iOS	Android
No subscription Blocks both apps and websites	Blocks selected apps such as Instagram or YouTube Shorts Math puzzles or breathing exercises as an unlock step
Closed source Phone only	Android only Determined users can still get past the challenge
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.