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Comparison · Browser extension (open source)

ZenTab vs LeechBlock NG

LeechBlock NG is a free, open-source extension for Firefox, Chrome and Edge. It's loved for its flexibility: up to 30 block sets, each with its own sites, times and limits. ZenTab is a Chrome extension that blocks distracting sites, hides endless feeds and turns focus time into a streak, free to start with a $10 one-time Pro.
Prices and features checked on . Sources are listed below.

At a glance

Price
ZenTab: Free; Pro is $10 once, with a 14-day refund
LeechBlock NG: Free and open source
Where it works
ZenTab: Chrome, Edge and Brave on desktop (Windows, Mac, Linux, ChromeOS)
LeechBlock NG: Firefox, Chrome, Edge and other Chromium browsers
Website blocking
ZenTab: 10 sites free; unlimited, page-level rules and allowlist mode with Pro
LeechBlock NG: Up to 30 block sets with wildcards, exceptions and keywords
Schedules and time limits
ZenTab: Schedules and daily limits with Pro
LeechBlock NG: Time periods, time limits like 10 minutes an hour, or both
Hard to undo in a weak moment
ZenTab: Strict Mode; Nuclear mode and commitment locks with Pro
LeechBlock NG: Lockdown, a password or random access code for options, and delays
Hide feeds, keep the site
ZenTab: YouTube Shorts free; 15 feeds on 9 sites with Pro
LeechBlock NG: Not a dedicated feature
Focus timer
ZenTab: Pomodoro presets free; Flowtime and custom timers with Pro
LeechBlock NG: No focus timer
Motivation
ZenTab: GitHub-style focus streak, Earned Time, achievements
LeechBlock NG: Statistics page
Adult content
ZenTab: Adult sites blocked free; urge challenges, SafeSearch and a 30-minute lock with Pro
LeechBlock NG: Its developer says it isn't designed for blocking offensive content
Blocks desktop or phone apps
ZenTab: No: browser only, plus a free DNS guide for phones
LeechBlock NG: No
Account needed
ZenTab: No; optional Google sign-in for sync
LeechBlock NG: Not required

Where LeechBlock NG is better

  • Free and open source.
  • Works in Firefox, including Firefox for Android.
  • Extremely flexible rules: 30 block sets, per-hour limits, delays and keyword blocking.

Where ZenTab is better

  • Ready-made packs and a 60-second setup, instead of configuring block sets.
  • Feed Eraser keeps the useful parts of YouTube, Reddit and LinkedIn.
  • A focus timer, ambience, tasks and a streak in the same extension.
  • Adult content protection that LeechBlock's developer advises against using it for.

Which should you pick?

Choose LeechBlock NG if…

You use Firefox, want open source, and enjoy configuring precise rules.

Choose ZenTab if…

You use Chrome and want blocking, focus sessions and a streak working together with little setup.

Sources

Checked on from LeechBlock NG's own pages. Prices can change and may differ by country or app store. Spotted something out of date? Email hello@zentab.live and we'll fix it.

Frequently asked questions

Is LeechBlock NG free?

Yes. It's free and open source under the Mozilla Public License 2.0.

Does ZenTab work in Firefox?

Not yet. ZenTab works in Chrome and Chromium browsers such as Edge and Brave.

Is ZenTab open source?

No. ZenTab's extension doesn't load remote code, keeps your data in your browser by default, and never uploads your browsing history.

Try ZenTab free

Block distracting sites, hide endless feeds and grow a focus streak. Free forever, with a 7-day Pro trial and no card. Pro is $10 once, with a 14-day money-back guarantee.

Add to Chrome, it's free See pricing

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