LeechBlock NG review

LeechBlock NG is a browser extension that does one job in detail: it blocks the sites you choose, when you choose. You can create up to 30 sets of sites, each with its own times and days, and block them during fixed periods such as 9am to 5pm, after a time limit such as 10 minutes in every hour, or with both rules combined. Site lists accept wildcards and exceptions, so you can block a whole domain but allow one useful subdomain. Lockdown blocks sites immediately for a duration you set, and a password or random access code on the options page slows you down when you are tempted to undo it. It runs in Firefox, Chrome, Edge and other Chromium-based browsers such as Brave, Opera and Vivaldi, and it costs nothing. The developer notes it is not meant for parental control, and it cannot touch phone apps or desktop programs.

Who it is for

Students and remote workers who mostly get distracted in the browser and want detailed control for free.

Price

Free browser extension; no paid plan.

LeechBlock A Simple Free Productivity Tool
Quoted from the vendor pricing page on November 10, 2026.

Key features

• Up to 30 block sets with different times and days
• Block during fixed hours, after a time limit or both
• Wildcards and exceptions for site lists
• Lockdown to block sites immediately for a set duration
• Password or random access code on the options page

Strengths and weaknesses

• Strength: Completely free
• Strength: Fine-grained schedules and time allowances
• Strength: Works in Firefox, Chrome, Edge, Brave, Opera and Vivaldi
• Weakness: Browser only, with no phone or desktop app blocking
• Weakness: Setup takes more thought than one-tap apps
• Weakness: Not designed for parental control

Key facts

• Price: Free
• Browsers: Firefox, Chrome, Edge and other Chromium browsers
• Block sets: Up to 30
• Lockdown: Yes, for a set duration

Where it ranks

LeechBlock NG is No. 9 in our Best Free Focus Apps verdict.