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Zenwell vs Opal: catalog facts
Zenwell	Opal
Free Free and open source under the GPL-3.0 licence.	Freemium Free to download, with a paid Opal Pro subscription for more features.
Android	macOS, Android, iOS
Blocks selected apps such as Instagram or YouTube Shorts Math puzzles or breathing exercises as an unlock step	App blocking rules that apply on phone and desktop Focus timer that locks apps until it runs out
Android only Determined users can still get past the challenge	Some features require the paid Pro subscription Gamified rewards and friend invites may not suit everyone
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.