Focuser

Spec sheet

Purpose

Focuser is a free, open-source website and application blocker built in Rust.Read 4 Oct 2026 · github.com

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.Read 4 Oct 2026 · github.com

Integrations

The browser extension is listed for Chrome, Firefox, Edge, Brave, and Opera, with Chrome Web Store and Firefox Add-ons installs identified.Read 4 Oct 2026 · github.com

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.Read 4 Oct 2026 · github.com

License

The source code is offered under the MIT License.Read 4 Oct 2026 · github.com

Application blocking

It can block applications by executable name, full path, or window title.Read 4 Oct 2026 · github.com

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.Read 4 Oct 2026 · github.com

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.Read 4 Oct 2026 · github.com

Focus tools

It offers Pomodoro sessions that toggle blocks across work and break phases, plus daily time allowances for sites and apps.Read 4 Oct 2026 · github.com

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.Read 4 Oct 2026 · github.com

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.Read 4 Oct 2026 · github.com

Starter lists

It includes 1,207 domains across 13 ready-to-import categories.Read 4 Oct 2026 · github.com

Website blocking

It blocks domains, keywords, wildcards, URL paths, or the entire internet, with some pattern rules enforced by its browser extension.Read 4 Oct 2026 · github.com

Plans and prices

Every Focuser plan and price →

Where Specifiction places it

• Distraction Blocking Software#17 of 297.8