I was thinking how useful it would be to have a reminder, then realized I hadn’t checked for it. Three dollars gets you day, a few days before, a few more days before and a week heads up, and similar ones for ovulation and fertility, as well as predictions. It’s discrete and visual, and to put in a new period, you just click a button. You can also look back in a little list of your periods and their lengths, above which is a circle representing your cycle with a little blue cube indicating where you are, and a six month view showing the current month, two months previous, and projection for the next three. And again it’s super cute but also in a very neutral way that can appeal to almost anyone - a little white cube with eyes, a bunch of tiny cubes that organize themselves into the number of the day you’re on, a bluer-teal, white and grey color scheme that makes me feel like my cycle is pretty chill after all, and nothing to sweat about. I never write reviews. Worth every penny.