It gets to know you

This app is very accurate at predicting periods, but you have to give it a little time. I know this sounds like a pain, but the fact of the matter is your period only comes once a month, and its different for every woman. After about 4-6 cycles, this app learned to predict my periods to the day, on point! You have to put your initial cycle (21 days, 28...) but after a while it goes by your own body. You have to be consistent putting in your info and it will get you. I love it.

Taisha Cruz about Period Diary Pro