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BlockSite vs ScreenZen: catalog facts
BlockSite	ScreenZen
Freemium Free to start; BlockSite Premium is a paid subscription with a 30-day guarantee.	Free Free with no subscription, supported by donations.
Android, iOS, Browser extension	Android, iOS
Blocks both websites and apps Focus Mode for timed work sessions	No subscription Blocks both apps and websites
Some features require a paid Premium subscription Closed-source commercial product	Closed source Phone only
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.