Elegant, complete, private
The only fertility awareness charting apps as complete and versatile as Lily are Fertility Friend and Kindara. Unlike these competitors, Lily does not collect your data. Plus Lily is more attractive than FF, and unlike FF you do not need an Internet connection to use the app. The loading time for charts is more or less instant (Kindaras loading time is unacceptably long). Lily has a lovely continuous ribbon mode which allows you to see how a new cycle continues from the last cycle. The ability to export PDFs of your cycles is good both to keep a record, and to have it in a larger format where you can see the notes side-by-side with the chart. A few features which could be improved: as a long-time charter, I find it annoying that you cannot override Lilys interpretation. (Lily goes by the book... sometimes my body doesnt.) Also, the chart could be made easier to read on a phone screen by making the temperature axes wider and the cervical fluid bars higher. Nevertheless, Lily is a great charting app-- one of the best.
Blaze Birch about
Lily - Fertility Calculator