Toggl Track

toggl.com/track

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One-click time tracking with automatic reporting, project categorization, and integrations with popular project management and invoicing tools.

Why it is useful

Has one of the lowest-friction time-tracking interfaces available — a single click starts a timer, and you can add context later. The free tier includes unlimited projects, clients, and time entries with basic reporting, making it useful for freelancers and individuals without paying anything. The weekly reports alone are eye-opening for understanding how time actually gets spent.