Good for focus
No real customization possible in the free version, but the 25/5 set-up is standard if you know the Pomodoro technique. The sounds are perfectly adequate for me. The wave sound during the longer breaks makes it impossible to concentrate, which is good, and the old-fashioned ticking in the work intervals really helps keep me focused.
histphd about
Focus Keep Free : Work & Study Timer, v1.8.4