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Fokuser

A simple focus timer that blocks the sites you pick while it runs.

Reviewed by Xplorekit's independent developer · Last checked · How we choose

Add to Chrome Open source · Chrome Web Store · Source on GitHub

Why it's a strong pick

Fokuser keeps the job small: one timer and one blocklist, with no account. It is open source under the Apache-2.0 license and uses Manifest V3, Chrome's current extension format. The README calls it free. Its latest GitHub release, version 1.3.2, is from 18 September 2026.

What it does

The README describes it as a free and open-source Chrome extension "that lets you set a focus timer to block sites to help you focus on your priorities". Start the timer and the sites on your blocklist stay closed until it ends.

Key features

  • Focus timer. The toolbar badge updates as time passes.
  • Blacklist and whitelist. Choose which sites to block or allow.
  • Fullscreen focus mode.
  • Time-saved tracking. See how much time blocking gave back.
  • No account. The README says data stays on your device.

Who it's for

It suits people who want a simple timer plus a blocklist and nothing more. It is not a time tracker, and it is not a Pomodoro tool with cycles. It is one timer and a list. It is also very new and small, from a single small team.

What permissions does Fokuser ask for?

Its source manifest lists scripting, alarms, storage and tabs, with an optional contentSettings permission. It also runs a content script on all URLs at document start, which is how it blocks pages. That means it runs on every page you open. The list is for version 1.3.2.

Where does Fokuser keep my data?

The README says: "All data stays on-device using chrome.storage.local". That is the developer's own statement, and the README says nothing more about data use. This is a claim, not a policy. We could not read the developer's privacy policy when we checked; read it before installing.

How is it different from LeechBlock NG?

Fokuser is a timer first, with a blocklist that runs while the timer does. It is a smaller, newer project, and it keeps its settings simple. For rich schedules and rules, see LeechBlock NG. Pick Fokuser if you want a quick start with few settings.

FAQ

Is it free? The README says it is free and open source under Apache-2.0.

Does it need an account? No account is mentioned in the README.

Can I block only some sites? Yes. It has a blacklist and a whitelist.

Good to know

Start with a short timer and a small blocklist. Add the sites that pull you away most often, then grow the list. Because the project is new, check the GitHub releases from time to time to see that it is still updated. It blocks on every page, so do not rely on it for strict control.

Other distraction blockers to compare

Fokuser is one of 5 picks in our website and distraction blockers guide:

This is a third-party extension, not built or maintained by Xplorekit. We link to the official Chrome Web Store listing — install and permissions are entirely between you and the extension's own publisher.