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LeechBlock NGStayFocusd
Free

Free to install and use.

 Free

The site describes it as always free.

Browser extension Browser extension
  • Up to 30 block sets, each with its own schedule
  • Blocks by fixed time period, time allowance or both
  • Daily time limits as well as outright blocking
  • Nuclear Option for a full block over a set period
  • 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
  • Built for Chromium browsers such as Chrome and Edge
  • The website uses advertising and analytics cookies
Browser extension 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

Checked September 23, 2026

Checked September 23, 2026

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