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StayFocusd vs BlockSite: catalog facts
StayFocusd	BlockSite
Free The site describes it as always free.	Freemium Free to start; BlockSite Premium is a paid subscription with a 30-day guarantee.
Browser extension	Android, iOS, Browser extension
Daily time limits as well as outright blocking Nuclear Option for a full block over a set period	Blocks both websites and apps Focus Mode for timed work sessions
Built for Chromium browsers such as Chrome and Edge The website uses advertising and analytics cookies	Some features require a paid Premium subscription Closed-source commercial product
Browser extension	Downloadable app, Browser extension
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 September 23, 2026

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