Best picks by scenario
Best customizable free blocker
LeechBlock NG is strong for rules, schedules, and delay tactics.
Best simple Chrome limiter
StayFocusd fits users who want daily limits on distracting sites.
Best advanced filter-list tool
uBlock Origin is powerful for technical users who can manage custom lists.
Compare tools
| Tool | Best for | Platforms | Privacy | Key difference |
|---|---|---|---|---|
| BlockSite | Users who want a familiar mobile and browser blocker for sites, keywords, apps, and focus sessions. | iOS, Android, Chrome, Firefox, Edge, and desktop browser extension support depending on current product terms. | Medium | Best as a familiar mobile and browser blocker for sites, keywords, and focus sessions. |
| LeechBlock NG | Users who want a highly customizable free browser-level blocker with time rules and delay tactics. | Firefox, Chrome, Edge, and other supported browser-extension environments depending on current listings. | Low to medium | Best for advanced free browser-level rules and time windows. |
| StayFocusd | Users who want to limit time spent on specific websites from a browser. | Chrome and Chromium-based browser environments depending on current extension support. | Low to medium | Best for limiting time on known sites in Chrome. |
| WasteNoTime | Safari users who want blacklist rules and time limits inside the browser. | Safari and Apple ecosystem support depending on current App Store listing. | Low to medium | Best for Safari users who want browser-level blacklists and time limits. |
| uBlock Origin | Advanced users who want custom filter lists and browser-level blocking controls. | Firefox, Chromium-based browsers, and other supported browser environments depending on current extension policies. | Low to medium | Best for advanced users who can manage custom filter lists and browser-level rules. |
| Plucky | Advanced users who want stricter automated filtering and delayed-change controls. | Desktop and browser workflows depending on current product support. | Medium to high | Best for technical users who want stricter automated filtering and delayed configuration changes. |
Tool profiles
BlockSite
Best as a familiar mobile and browser blocker for sites, keywords, and focus sessions.
Best fit: Users who want a familiar mobile and browser blocker for sites, keywords, apps, and focus sessions.
Platforms: iOS, Android, Chrome, Firefox, Edge, and desktop browser extension support depending on current product terms.
LeechBlock NG
Best for advanced free browser-level rules and time windows.
Best fit: Users who want a highly customizable free browser-level blocker with time rules and delay tactics.
Platforms: Firefox, Chrome, Edge, and other supported browser-extension environments depending on current listings.
StayFocusd
Best for limiting time on known sites in Chrome.
Best fit: Users who want to limit time spent on specific websites from a browser.
Platforms: Chrome and Chromium-based browser environments depending on current extension support.
WasteNoTime
Best for Safari users who want browser-level blacklists and time limits.
Best fit: Safari users who want blacklist rules and time limits inside the browser.
Platforms: Safari and Apple ecosystem support depending on current App Store listing.
uBlock Origin
Best for advanced users who can manage custom filter lists and browser-level rules.
Best fit: Advanced users who want custom filter lists and browser-level blocking controls.
Platforms: Firefox, Chromium-based browsers, and other supported browser environments depending on current extension policies.
Plucky
Best for technical users who want stricter automated filtering and delayed configuration changes.
Best fit: Advanced users who want stricter automated filtering and delayed-change controls.
Platforms: Desktop and browser workflows depending on current product support.
Selection checklist
- Install the extension in every browser that matters.
- Check private browsing and alternate profile behavior.
- Use DNS or system-level blocking if switching browsers is easy.
- Review extension permissions before granting broad site access.
Related guides
Country notes
FAQ
Are browser extensions enough?
They are enough for some users with predictable browser habits, but they are easy to bypass by switching browsers or devices.
Which extension is best for advanced rules?
LeechBlock NG and uBlock Origin are the strongest comparisons for users comfortable with custom rules.
What is the privacy tradeoff?
Extensions may request access to browsing data or page content. Review permissions before installing.
Important note
This page is informational and does not provide medical advice. Product features, pricing, app permissions, and platform support can change. Verify current details before buying.