My addition to the list is Ora.pm which combine Trello and Toggl. Ora gives you detailed reports about where you spent your time. Also, you can focus on your current tasks without distraction.
I'm not familiar with it I'll check it out! But I have to add
Toggle is more then time tracking, its detecting your PC activity and pauses the timer when you are idle (I have accurate timings not just estimating and adding X hours like Jira has). It creates invoices for your clients if you do project-based work per hour. Can work as a desktop app or browser plugin.
Toggle has time tracking and other plugins, but not so free (only 1 free addon per space I think).
Yeah, Toggl is a great product. I really like it. Ora has plans for desktop time tracking with auto pause timer and report which app you are using.
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