LeechBlock NG is a free, open-source browser extension developed by James Anderson that helps users manage their time and improve productivity by blocking distracting websites. Its core feature allows for highly configurable blocking rules, enabling users to specify which sites to block, when to block them (e.g., during work hours), and for how long, including complex schedules and lockout periods. This tool is primarily built for students, remote workers, and anyone struggling with online distractions and procrastination. It fits into a workflow when a user needs to concentrate on a task, triggering them to activate a blocking schedule to prevent access to social media, news sites, or other time-wasting domains. LeechBlock NG works across all websites and is a browser-native solution.
Editorial check
How this page is checked
Source trail
proginosko.com
External links are separated from Surfaced commentary.
Reader safety
Context before clicks
Product links and external services are not presented as guarantees.
Monetization
No affiliate flag
Ads and commerce links are kept distinct from editorial text.
Surfaced take
Why It’s Useful
LeechBlock NG offers far more granular control and sophisticated scheduling than simpler site blockers like StayFocusd or Cold Turkey, making it superior for developing sustainable focus habits. For the student trying to write a thesis, they can set up a strict schedule that blocks all social media and entertainment sites during their dedicated writing hours, with no easy bypass. For the freelance professional needing deep work sessions, they can configure short "breaks" to access certain sites, then be immediately locked out again, enforcing discipline. It is entirely free and open-source, with all its powerful features available without cost. A powerful feature often overlooked is the "delay" option, which introduces a short waiting period before accessing a blocked site, giving users a chance to reconsider. It's not more popular because its robust configuration options can seem daunting to new users, and many prefer simpler, less effective solutions. It is actively maintained with regular updates and a dedicated user base.
Enjoyed this? Get five picks like this every morning.
Free daily newsletter — zero spam, unsubscribe anytime.