I have a number of round timer apps, but this one is my favorite. Lacks couple of features (ability to save different routines for one), but otherwise convenient and snap to use.
But the latest OS4 update actually broke it somewhat. It used to save state when you quit it. Now it seems to lose it sometimes - not every time, but once in a while you restart it, and it starts from scratch :(
Bring the old behavior back!
ArcxX about Round Timer