Spot-On Analysis
It’s not the most fully featured app, but despite another company’s newer app that had more features—iOS Health integration and an Apple Watch app (and gender neutral styling)—and claimed to be “beautifully scientific,” I have come back to Lily realizing that the most important thing about a cycle tracking app is its analysis because Whoever programmed Lily obviously has a deep understanding of sympto-thermal methods such as Fertility Awareness Methods (FAM), Natural Family Planning (NFP).
While I have not yet read up on the Billings Method, I can say that for the past two years, I—with only a basic understanding of cervical fluid that Toni Weschler covers in her books—have been using cervical fluid only and have been pleased with this app’s analysis. And now that I have a Yono ear thermometer, I have been using cervical fluid *and* BBT for a full cycle now and can say that Lily analyzes also the BBT data expertly.
My only quibble is that when I using cervical fluid only, every day was a fertile day, which is obviously not true. That said, I don’t think I ever disagreed with how it calculated my date of ovulation. Throw in cervical fluid and BBT, and now it gives me not only my date of ovulation but also my fertile/infertile days its analysis is spot on.
As for the styling, yes, Lily has stereotypically feminine colors—pink, light blue, purple. But, if you can ignore that, this app is not cheap, or cartoonish, or otherwise unrefined and looks very professionally designed. And I especially like that that the app has day/night modes whose times you can customize.
It would be nice to have iOS Heath integration and an AW app (and gender neutrual aesthetics). But for anyone who has even only a modicum of a clue for their menstrual cycles, this is the app I recommend to them.
ScentedLead about
Lily - Fertility Calculator, v3.4.3