LeechBlock NG review
A free, open-source browser blocker with unusually detailed scheduling and matching controls.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
LeechBlock NG is a free, open-source browser extension for people who want to restrict distracting websites during defined periods or after configurable usage limits. It supports user-specified websites and URL paths, making it suited to personal productivity workflows that need more control than a simple on-or-off block. It is intended for individual focus rather than parental control or offensive-content filtering, and its scope centers on browser-based website blocking.
The product’s main strength is the depth of its blocking rules. Users can create up to 30 block sets, schedule them for selected days, apply fixed time periods or usage limits, and trigger an immediate lockdown for a specified duration. Matching controls include keywords, wildcards, exceptions, and regular expressions, which can help distinguish specific sites, paths, or URL patterns. Temporary overrides can have configurable limits, while countdown timers and warning messages provide visible reminders before or during restrictions. Password or random access-code protection can restrict access to settings.
LeechBlock NG fits Firefox, Chrome, Edge, other Chromium-based browsers, and Firefox for Android. It is a browser extension rather than a standalone macOS, iOS, or native mobile app, so it is a better match for browser-focused distraction control than for device-wide blocking across applications. The product is free, with no paid plans, making its extensive rule set available without a tiered upgrade path. Choose it if you want detailed website schedules, recurring limits, lockdowns, and matching rules at no cost. Choose an alternative if you need whole-device controls, a native mobile app, parental-control features, or content filtering.
LeechBlock NG pros and cons
- Where it wins
- Up to 30 configurable block sets with schedules and usage limits
- Detailed keyword, wildcard, exception, and regular-expression matching
- Lockdowns, overrides, countdowns, and password protection
- Where it doesn't
- Focused on browser websites rather than whole-device blocking
- No standalone macOS, iOS, or native mobile app
- Not intended for parental control or offensive-content filtering
LeechBlock NG fact sheet, pricing and score →
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