Free Version is very basic

The free version would work well if your cycle is regular and predictable... But then again, you really wouldnt need an ovulation predictor if that is the case. Dont waste your time with this one. Perhaps the $2.99 upgrade could do the trick, but I cant attest to its usefulness.

JapaneseParsley about Ovulation and Pregnancy Calendar (Fertility Calculator, Gender Predictor, Period Tracker)