Its only been a month but...
I have only used this app for a month now but I find it incredibly detailed and very accurate. All the questions they ask and data they recommend you fill out actually begins calculating an individual profile of your body and its cycles. I downloaded 3 apps at once to see which one I would end up using and this has been the easiest and only one out of the 3 I like.
D. Stubbs about
Ovia: Fertility, Cycle, Health, v3.9.9