Good, could be better
It mostly does what its supposed to, but has some issues for me. For example, the chart gets real crowded if you have a long cycle and you cant zoom in without it crashing. Also the 70 day cycle length limit is pretty annoying, given that people who use this sort of app are pretty likely to have some issues with fertility. Would be nice to have more of the tcoyf options, like cervical height, or watery CF. Its great that you can add symptoms and medications, but it would be nice if you could also select ovulation day and set the coverline yourself. Definitely overpriced - some of the free ones seem almost as good, or even better.
MXMike about
FemCal: The Fertility Calendar