I started using this in conjunction with Ovia, because Ive been using Ovia for six months and havent been able to conceive yet. I noticed complaints in other reviews about missing features. I have been using FF for two months (downloaded after the latest update). I still have the calendar, chart, charting lessons, and fertility stoplight feature. I have not been asked to pay anything, nor have I purchased anything. I can still keep track of everything that Ovia can track and thats all I need. I have heard of women having more luck with FF than with Ovia which is why I switched. I keep Ovia because of the community and the anonymity in it. In this app you do have to have a membership to access the forum. Hope this is helpful. Baby dust to you ladies!