My memory is so bad I definitely need to write it down if I want any hope of knowing where I'm at in my cycle. I also used to try to track more symptoms, which helped me learn a lot, but now I just do the minimum. A physical notebook or even notes app would work just as well, but I just do better if it's on my phone and like the visual calendar. And also use Drip so not worried about the data getting out. I agree you don't need any fancy apps, but don't like the implication in the article that tracking at all is useless.