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Opal vs ScreenZen: catalog facts
Opal	ScreenZen
Freemium Free to download, with a paid Opal Pro subscription for more features.	Free Free with no subscription, supported by donations.
macOS, Android, iOS	Android, iOS
App blocking rules that apply on phone and desktop Focus timer that locks apps until it runs out	No subscription Blocks both apps and websites
Some features require the paid Pro subscription Gamified rewards and friend invites may not suit everyone	Closed source Phone only
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	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.