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LeechBlock NGSelfControl
Free

Free to install and use.

 Free

Free and open source, supported by donations.

Browser extension macOS
  • Up to 30 block sets, each with its own schedule
  • Blocks by fixed time period, time allowance or both
  • Block cannot be undone until the timer expires
  • Survives restarts and deleting the app
  • 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
  • macOS only
  • No way to end a block early if you set it wrongly
Browser extension Downloadable app
Closed source Open source
License not stated License not stated
No account needed No account needed
Not stated if it works offline Works offline

Checked September 23, 2026

Checked October 1, 2026

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