The best website blocker alternatives
Every popular blocker, compared honestly: what each does well, where it falls short, and what it really costs.
Last updated June 5, 2026
Five things that actually matter
- Is the free tier actually usable — or just a 3-site teaser for the paid plan?
- Does it collect your browsing data — extensions have deep access, so trust matters.
- Does it cover your browsers — Chrome and Firefox at minimum, ideally with sync.
- Can you set it up in two minutes — without reading documentation?
- What does it really cost — monthly, yearly, and lifetime, after the intro price.
SiteBlocker
Every blocking feature is free with no site limit: blocklists, scheduling, whitelist mode, Focus Mode with Pomodoro, and cross-device sync, with zero data collection. Pro (from $2.99/mo) adds keyword blocking and the full Insights dashboard. Chrome and Firefox.
Add SiteBlocker freeHow the others compare
BlockSite
directThe mass-market site and app blocker, with the category’s biggest install base.
Pricing: Free, capped at 3 blocked sites · Around $39.99 lifetime (pricing varies by platform and frequent sales)
Read the comparisonFreedom
directThe premium, cross-platform blocker that syncs one focus session across every device.
Pricing: Free, but sessions are capped (no scheduling, no locked mode) · $8.99/mo · about $39.96/yr · $99.50 lifetime
Read the comparisonCold Turkey
directThe “nuclear option”: the hardest-to-bypass blocker for desktop power users.
Pricing: Free (website blocking, timed blocks, stats) · About $39 one-time (single device) / $49 (unlimited)
Read the comparisonStayFocusd
directThe classic free Chrome time-limiter with a hard “Nuclear Option”.
Pricing: Free
Read the comparisonLeechBlock NG
directThe free, open-source power-user blocker with the deepest configuration.
Pricing: Free and open source
Read the comparisonWebsite blocker alternatives: FAQ
What is the best free website blocker?
For most people, SiteBlocker is the strongest free option: it gives away custom blocklists, scheduling, whitelist mode, Focus Mode, and cross-device sync with no site limit, and collects zero data. LeechBlock NG and StayFocusd are also fully free but lack cross-device sync and a modern interface.
Do website blockers work on Firefox?
Some do. SiteBlocker, Freedom, and LeechBlock NG support Firefox. BlockSite and StayFocusd are Chrome and Edge focused, and Cold Turkey is a desktop app rather than an extension.
Are website blockers free?
Many have free tiers, but the limits vary widely. SiteBlocker, LeechBlock, and StayFocusd offer free blocking; BlockSite caps free users at 3 sites; and Freedom’s free plan limits you to a few short sessions. SiteBlocker’s paid Pro tier (from $2.99/mo) is optional and only adds keyword blocking and full insights.
Which website blocker is hardest to bypass?
Cold Turkey is the strictest, with locked blocks and a whole-machine freeze, but it is desktop-only. Among extensions, StayFocusd’s Nuclear Option and SiteBlocker’s hard Focus Mode provide strong enforcement.
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