Focuser
Focuser is a free, open-source blocker for websites and applications, built in Rust.
What Focuser is
Focuser is a free, open-source blocker for websites and applications, built in Rust. It can block domains, keywords, wildcards, URL paths, or all internet access, though some pattern rules are enforced by its browser extension. Applications can be blocked by executable name, full path, or window title. Focus tools include Pomodoro sessions that switch blocking between work and break phases, daily time allowances, and weekly schedules. Lists can be locked for a chosen duration, preventing edits or disabling until the timer ends. The project includes 1,207 domains across 13 ready-to-import categories. Browser extensions are listed for Chrome, Firefox, Edge, Brave, and Opera. Block lists and statistics stay in a local SQLite file; the project says it has no cloud sync, accounts, analytics, or telemetry. Its extension checks tab URLs locally, without sending or logging them. Focuser is available for Linux, macOS, and Windows, and no mobile apps are listed.
Good
- Blocks websites and applications.
- Supports Pomodoro sessions and daily allowances.
- Weekly schedules and locked sessions are available.
- Stores lists and statistics locally.
- Browser extensions are listed for five browsers.
Watch out
- No mobile apps are listed.
- Some pattern rules are enforced by the browser extension.
- Block lists and statistics are stored in a local SQLite file.
Who it suits
Focuser suits people who want scheduled blocking for both websites and desktop applications. It may fit users who prefer local storage and open-source software, and do not need a mobile app.
Verdict
Focuser offers several ways to block sites and apps, with scheduling and timed locks. Its local-only data approach and lack of mobile apps may determine whether it fits your setup.
Plans and prices
From Focuser's own pricing page, checked 4 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | Free, open-source blocker |
The facts
Each one read from Focuser's own pages, with the date it was checked.
Where it runs
- Application blocking
- It can block applications by executable name, full path, or window title.checked 4 Oct 2026
- Platforms
- Release downloads are provided for Windows, macOS Intel and Apple Silicon, and Linux; the README says Windows 10/11 is tested while macOS and Linux builds need real-world testing.checked 4 Oct 2026
What it does
- Data sharing
- The privacy policy says Focuser does not sell, transfer, or share user data with third parties and that the extension uses no third-party services.checked 4 Oct 2026
- Extension privacy
- The privacy policy says tab URLs are checked locally, never sent to an external server, and not stored or logged by the extension.checked 4 Oct 2026
- Focus tools
- It offers Pomodoro sessions that toggle blocks across work and break phases, plus daily time allowances for sites and apps.checked 4 Oct 2026
- Integrations
- The browser extension is listed for Chrome, Firefox, Edge, Brave, and Opera, with Chrome Web Store and Firefox Add-ons installs identified.checked 4 Oct 2026
- License
- The source code is offered under the MIT License.checked 4 Oct 2026
- Local data
- The project says block lists and statistics are stored locally in a SQLite file and that it has no cloud sync, accounts, analytics, or telemetry.checked 4 Oct 2026
- Purpose
- Focuser is a free, open-source website and application blocker built in Rust.checked 4 Oct 2026
- Scheduling and lock
- Block lists can follow a weekly schedule and be locked for a chosen duration so they cannot be disabled, deleted, or edited until the timer ends.checked 4 Oct 2026
- Starter lists
- It includes 1,207 domains across 13 ready-to-import categories.checked 4 Oct 2026
- Support
- The project asks users to report bugs by opening a GitHub issue with expected and actual behavior, OS and browser version, and reproduction steps.checked 4 Oct 2026
- Website blocking
- It blocks domains, keywords, wildcards, URL paths, or the entire internet, with some pattern rules enforced by its browser extension.checked 4 Oct 2026
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