SiteBlocker vs LeechBlock NG
Two ways to block distracting sites, compared honestly. The free, open-source power-user blocker with the deepest configuration.
SiteBlocker gives every blocking feature away free (with Pro from $2.99/mo for keyword blocking and full insights) and collects zero data. LeechBlock NG is the most feature-complete free blocker, and the closest match to SiteBlocker’s blocking, including keyword blocking. Its gaps are sync, insights, and approachability.
Feature comparison
| Feature | SiteBlocker | LeechBlock NG |
|---|---|---|
| Price | Free; Pro from $2.99/mo | Free (open source) |
| Scheduled blocking | Free | Yes (up to 30 block sets) |
| Whitelist mode | Free | Yes |
| Keyword blocking | Pro | Free |
| Focus Mode + Pomodoro | Free | Lockdown timer only |
| Cross-device sync | Free | No |
| Insights dashboard | Yes (full on Pro) | No |
| Ease of use | Friendly, modern UI | Power-user, steep learning curve |
| Browsers | Chrome, Firefox | Chrome, Firefox, Edge |
| Open source | No | Yes |
What LeechBlock NG does well
- + Extremely flexible: up to 30 block sets, time limits, and wildcard rules
- + Keyword blocking, whitelist, and a password lock, all free
- + Genuinely open source, with a strong privacy and trust story
Where LeechBlock NG falls short
- – No cross-device sync: settings live in one browser and must be re-entered everywhere
- – No insights or charts, and no Focus Mode or Pomodoro
- – A power-user interface with a real learning curve, and no mobile
SiteBlocker is best for…
You want blocking that just works across your devices, with sync, insights, Focus Mode, and a friendly interface.
LeechBlock NG is best for…
You want maximum control, you enjoy configuring things yourself, and you value open source.
Try SiteBlocker free. You can keep your current blocker installed while you test it.
SiteBlocker vs LeechBlock NG: FAQ
Is SiteBlocker a simpler alternative to LeechBlock?
Yes. LeechBlock is extremely powerful but has a steep, power-user interface. SiteBlocker offers the same core blocking (including keyword blocking on Pro) with a clean, modern UI that most people can set up in under two minutes.
Does SiteBlocker sync across devices like LeechBlock?
LeechBlock does not sync: its settings live in one browser and must be re-entered everywhere. SiteBlocker syncs your blocklists, schedules, and settings across devices through a free account.
Is keyword blocking free in SiteBlocker like LeechBlock?
LeechBlock includes keyword blocking for free. In SiteBlocker, keyword blocking is part of the Pro tier ($2.99/mo). SiteBlocker’s edge is everything around it: sync, a full insights dashboard, Focus Mode, and a friendlier interface.
Is SiteBlocker open source like LeechBlock?
No. LeechBlock is open source, which some users prefer. SiteBlocker is closed source but privacy-first, collecting zero browsing data by default.
Last updated June 05, 2026
Competitor pricing and features are verified periodically and can change. Sources:
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