Type something to search...
Features

Powerful Features to Block Distractions & Improve Focus

Block distracting websites, start focus sessions, track your productivity, and sync across Chrome and Firefox. Your data stays private.

01

Custom Blocklists

Create multiple blocklists for work, study, or personal use.

02

Focus Mode

On-demand focus sessions with Pomodoro timer and strictness controls.

03

Smart Scheduling

Flexibly schedule website blocks — set specific times, recurring days.

04

Section Blocking

Block YouTube Shorts or Instagram Reels without blocking the whole site. Free.

Blocking

One click and the distraction is gone

Right-click any tab and add it to a blocklist. The next time you try to open that site — even on another device — SiteBlocker redirects you to a focus page so the "just five minutes" never happens.

  • One-click context-menu add
  • Cross-device sync via your account
  • Custom redirect message per list
  • Works on Chrome and Firefox

Do not want to add sites one by one? Install a ready-made list from the Blocklist Marketplace in one click.

facebook.com

This site is blocked

facebook.com is on your blocked list

Go Back
Capabilities

Everything you need to stay focused

Blocking is not all-or-nothing. You can block a whole site, or just one section of it — Shorts, Reels or a For You feed — and leave the rest working.

01

Focus Mode

Start on-demand focus sessions with customizable duration, Pomodoro timer, and strictness levels. Pick which blocklists to enforce — your distractions are blocked regardless of schedule.

facebook.com

This site is blocked

facebook.com is on your blocked list

Go Back
02

Keyword Blocking

Block pages by keyword — in URLs, page titles, or page content. Add words like "gambling" or "clickbait" and any page containing them gets blocked automatically. A Pro feature.

Work Focus schedule
M
T
W
T
F
S
S
Start
09:00
→
End
17:00
facebook.comblocked
twitter.comblocked
reddit.comblocked
03

Section Blocking

Block one part of a site without blocking the whole thing. Switch off YouTube Shorts, Instagram Reels, Reddit r/popular or Facebook Reels and the rest of the site keeps working — their buttons and thumbnails are hidden too, so they are not dangled in front of you. TikTok and X get their For You feeds hidden. Free for everyone.

Privacy dashboard
Zero data collected
Your browsing activity is never tracked
Browsing data collectedNone
Third-party trackingNone
Data sold to advertisersNever
Account requiredOptional
Comparison

How SiteBlocker compares

Other website blockers charge for features SiteBlocker includes for free.

Feature SiteBlocker BlockSite Freedom
Price Free (Pro from $2.99/mo) $3.99–10.99/mo $8.99/mo
Core blocking features All free 3-site limit on free Limited free trial
Scheduled blocking Free Paid only Paid only
Focus Mode / Pomodoro Free No Paid only
Keyword blocking Pro Paid only No
Analytics / Insights Basic free, full Pro Paid only No
Cross-device sync Free Paid only Paid only
Data collection None Yes Minimal
Browsers supported Chrome, Firefox, Edge, Safari Chrome only Chrome, Firefox
FAQ

Frequently Asked Questions

SiteBlocker is a Browser extension that helps you block distracting websites, stay focused, and improve productivity by controlling your browsing habits.
Simply add the website URL to your blocklist in the list. Once added, the site will be inaccessible until you remove it from the list or disable the list.
Yes, and it is free. Turn on the YouTube Shorts section in your block list and leave youtube.com off it. Shorts pages stop opening, the Shorts shelf and sidebar button disappear, and normal videos, subscriptions and search are untouched.
Six, all free. YouTube Shorts, Instagram Reels, Reddit r/popular and Facebook Reels are blocked by address, and their buttons and thumbnails are hidden so nothing tempts you. The TikTok and X For You feeds are hidden rather than blocked: each one is the site default rather than a separate page, so it can still be reached. Sections can follow the same schedule as the rest of your block list.
No. SiteBlocker prioritizes your privacy and does not collect or store any personal browsing data.
Yes! SiteBlocker allows you to set specific time periods when certain lists are blocked, helping you stay productive during work or study hours.
Yes, SiteBlocker is free. All core features — custom blocklists, section blocking, scheduling, Focus Mode, whitelist mode, and cross-device sync — are available at no cost. The optional Pro plan ($2.99/month) adds Locked Mode, daily time budgets, calendar-triggered blocking, keyword blocking, and the full analytics dashboard.
Yes, but you need to enable it manually. Go to your browser Extensions page, find SiteBlocker, and check the "Allow in Incognito" option (Chrome) or "Run in Private Windows" (Firefox).
SiteBlocker includes all core features for free — custom blocklists, scheduled blocking, Focus Mode with Pomodoro, whitelist mode, and cross-device sync. BlockSite limits free users to 3 blocked sites and charges $39.99 for full access. Freedom costs $8.99/month. SiteBlocker also collects zero browsing data, unlike both competitors.
Focus Mode lets you start on-demand distraction-blocking sessions. Pick a duration (25 minutes, 45 minutes, 1 hour, or custom), choose which blocklists to enforce, and optionally enable Pomodoro breaks. During a focus session, your selected sites are blocked regardless of your schedule settings.
The Pro plan ($2.99/month, $24.99/year, or $49.99 lifetime) adds Locked Mode focus sessions you cannot quit early, daily time budgets per site, calendar-triggered blocking, keyword blocking (block pages containing specific words in URLs, titles, or page content), and a full analytics dashboard — weekly activity charts, top blocked sites, hourly distraction heatmaps, focus session tracking, and cross-device insights sync. Basic stats (total blocks, streak, top 3 sites) are free for everyone.
Keyword blocking (Pro feature) lets you block any page that contains specific words — in the URL, page title, or page content. For example, add "gambling" as a keyword and any page with that word gets blocked automatically, even if the domain is not on your blocklist. URL and title keywords are checked instantly; page content is scanned after the page loads.
SiteBlocker is available on Chrome and Firefox. Your blocklists and settings sync across browsers when you sign in.
Go to the Extensions page, find SiteBlocker, and click "Remove." You can always reinstall it from the Chrome Web Store or Firefox Add-ons.
Ready to take back your time?

Install in Seconds. Free Forever.

Join thousands of people who have stopped losing hours to mindless browsing. SiteBlocker works on Chrome and Firefox — no account required, no data collected.

Get Extension