Drag the blue arrow to set a timer. Release to start! Click to pause.
When the time is up, a notification will show up with a nice sound.
Create new timers with CMD+N
Inspired by the great Minutes widget from Nitram-nunca I've been using for years. But it wasn't maintained anymore (non-retina) + it was the only widget in my dashboard :)
Timer requires OS X 10.11 or later.