NATTT

Not Another Time Tracking Tool... but wait! This one is different.
There are no timers and no dialogs to create and track time spent on your tasks.
Get an overview
The Calendar view clearly shows you which days are already tracked. You can filter tasks by category and export your tracked times as XLSX, CSV or JSON file.
Track time on tasks
In the Day view, type MyTask or MyCategory:MyTask once and NATTT will create a button for you. Tapping it adds 60 minutes by default but you can change this interval if needed.
Don't forget to track
During your custom working hours, you'll receive push reminders when the interval expires. NATTT won't bother you in the off hours.