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