Used to be great
I paid 10 bucks for this app. Back in the days it used to work. Now if I choose the manual mode for cycle days, the predictions are all off. According to this Ill have my period on the 20th cycle day, even though my average cycle is 30 days. If I turn the manual mode off, the app cant figure out which cycle day Im in, even though I told it I had my period in a certain day... I could be using my calendar instead. It would be do the same thing... And it would have been cheaper!
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Lady Biz - Period Tracker and Fertility Calendar, v5.3