I have an Android phone, the App is called "getbaby" it is a pink icon with white outline sperm on it.
You enter your cycle dates, as far back as you want, it gives your projected fertile, O and AF dates. It also shows you on the calender which dates are better if timing for a girl or boy.
It matches the other calanders I have but does not allow for notes on BD, symptoms etc like other calanders do.
Just wanted to share, GL and Baby dust ladies!!!