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LeechBlock NG vs BlockSite: catalog facts
LeechBlock NG	BlockSite
Free Free to install and use.	Freemium Free to start; BlockSite Premium is a paid subscription with a 30-day guarantee.
Browser extension	Android, iOS, Browser extension
Up to 30 block sets, each with its own schedule Blocks by fixed time period, time allowance or both	Blocks both websites and apps Focus Mode for timed work sessions
Browser extension only, so blocks apply inside supported browsers and not to other apps No Safari version; the site points macOS and iOS users to the separate ivBlock app	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
No account 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.