fwiw- I used Baby Tracker by nighp software, and I kept thinking it sucked but that there wasn't anything better. The thought also crossed my mind to make a better one myself, but I didn't actually want to do that, haha. I used it for the first 6 months maybe, and now I've fallen off using it. It was helpful when my partner and I were switching sleep schedules, to be able to check the log and remind myself when the last diaper/feed happened. We didn't use it for sleep tracking, ever.