Compare software

LeechBlock NG vs Cold Turkey Blocker: catalog facts
LeechBlock NG	Cold Turkey Blocker
Free Free to install and use.	Freemium Free website blocker, with a paid upgrade for more features.
Browser extension	Windows, macOS
Up to 30 block sets, each with its own schedule Blocks by fixed time period, time allowance or both	Blocks desktop apps as well as websites Locked blocks that are hard to bypass
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	Desktop only, no phone apps Some features require the paid version
Browser extension	Downloadable app
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.