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Opal vs PlugBrain: catalog facts
Opal	PlugBrain
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	Math challenges add friction instead of a hard block Difficulty adapts to how often you open the apps
Some features require the paid Pro subscription Gamified rewards and friend invites may not suit everyone	Android only No releases published on the GitHub repository
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
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.