Its an absolutely spectacular app, and helped me so much to understand my mood swings and decide whether they were to do with a larger issue or not. I would not be where I am today without it. Bless the developer(s).
Possibilities for the future: associate with an account so that you can transfer info easily when switching phones? :)
No need to improve yet though. Love it!
natlovesorganization about iPeriod Lite Period Tracker, v3.5