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BlockSite vs Opal: catalog facts
BlockSite	Opal
Freemium Free to start; BlockSite Premium is a paid subscription with a 30-day guarantee.	Freemium Free to download, with a paid Opal Pro subscription for more features.
Android, iOS, Browser extension	macOS, Android, iOS
Blocks both websites and apps Focus Mode for timed work sessions	App blocking rules that apply on phone and desktop Focus timer that locks apps until it runs out
Some features require a paid Premium subscription Closed-source commercial product	Some features require the paid Pro subscription Gamified rewards and friend invites may not suit everyone
Downloadable app, Browser extension	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 September 23, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.