Works for me!

I started using this app on my iPod touch back in 2012, and Ive backed up my data to my iPhone 4s and my iPhone 6 and have had no problems! The day Im supposed to start is always on spot(usually.) And its just interesting to know when youre ovulating and fertile. I definitely recommended it for all women, its useful for planning special nights and whatnot for sure!

Siiberia about Period Tracker by GP Apps, v9.3.5