I use this app to track various symptoms of my IBS. I also tried HabitHub and Loop, but only this app allowed me to track on a daily basis how many times a certain symptom occurred, and also set "goals" based on either "no more than" and "no fewer than" a given number of occurrences. I preferred the interface and graphs (I'd like to see a chart of raw numbers instead of just pass/fail) in some of the other apps, but from a purely functional standpoint this is the one to beat.