IFR pilots often face conditions where standard altitude selector is not well visible - think night flying in good old 172! Or the timer is left in the bag on the back seat of the car... Now this is the application I wrote for myself and for my friends flying IFR often enough. Up to three timers can be running at the same time - airtime, approach and hold, for example.
Added support for night mode which is activated with the right swipe and de-activated with left swipe.