HabitKit
Decent apps do things. They perform a necessary task, they save time and they offer an end result that is beneficial.
HabitKit ticks the required boxes and offers the information you need in a highly visual way. Set up some things that you need to do, assign them a colour and tap once each day when you have done it. The end result is a visual masterpiece of information that would be hard to improve.
You do not need to track everything to the point of wasting too much time, but when you get benefits that seriously outweigh the effort put in, you know that the app is worthwhile. That's HabitKit.