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SelfControlLeechBlock NG
Free

Free and open source, supported by donations.

 Free

Free to install and use.

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

Checked October 1, 2026

Checked September 23, 2026

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