I'm only giving it a 2 star rating because I've made a purchase already on my iPhone and now I've switched to an android but have forgotten my log in info and there's no way to contact customer support. Overall the tracker just keeps tracks of your logging of periods. Sometimes the calculation of ovulation can be a little off but I'm sure that's only based on how many logging in of periods you have. I don't really use much of the other features on this app. But overall I do like it.