The best LeechBlock NG alternative
A free, privacy-first website blocker for Chrome and Firefox. The free, open-source power-user blocker with the deepest configuration.
Free forever. No account required to start. Pro adds keyword blocking and full insights.
Why people leave LeechBlock NG
- You want your blocklists to sync across devices automatically
- You want an interface you don’t have to study
- You want insights and a Focus/Pomodoro mode it doesn’t offer
SiteBlocker in one line
SiteBlocker doesn’t hold its core features hostage. Custom blocklists, scheduling, whitelist mode, Focus Mode with a Pomodoro timer, and cross-device sync are all free, with zero data collection. Pro ($2.99/mo, $24.99/yr, or $49.99 lifetime) adds keyword blocking and the full Insights dashboard.
SiteBlocker vs LeechBlock NG
| 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 |
Where LeechBlock NG is strong
- + 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 it 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
Choose SiteBlocker if…
You want blocking that just works across your devices, with sync, insights, Focus Mode, and a friendly interface.
Stick with LeechBlock NG if…
You want maximum control, you enjoy configuring things yourself, and you value open source.
How to switch from LeechBlock NG
- 1
Install SiteBlocker from the Chrome Web Store or Firefox Add-ons and (optionally) create a free account for cross-device sync.
- 2
Open your LeechBlock NG block list, copy the sites you block, and add them to a SiteBlocker blocklist. Set up any schedules or a whitelist while you’re there.
- 3
Once everything works, remove LeechBlock NG. The whole move takes about five minutes.
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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