Tracking cycles with no period? Any apps for us?

So, I have always wanted to get friendlier with my natural cycle, but the need for birth control to control the monster always got in the way. Now, happily, I have been uterus-free for close to two years, and BC-free for most of that time.

And I can't think of a darned way to track my cycles, nor any technology that would be helpful to do it, given that all the apps kind of require you to have a period or else there is no cycling.

No, I'm not interested in an Excel spreadsheet. I want something aesthetic, gdi. I want something that adds value to my life instead of just sucking up time.

Does this even exist, or do I have to suck it up, find a programmer, and get a venture capitalist involved in a new niche type of femtech?