Pomodoro One does exactly what you’d expect.
It’s a Pomodoro timer that has an alarm that goes off after a set interval.
Then, it sounds an alarm and gives you a break from work.

The app also tallies up how many of these cycles you go through during the day.
It’s a no-frills app, but that’skind of the point anyway.
Pomodoro One(Free) | Mac App Store