It's been a while, so please allow me some self-promotion...

@belle and I make a bunch of apps, the main one being Exist. It's for tracking data about your life and habits to have everything in one place. We find trends and correlations to show how things affect your mood, sleep, etc. Folks have found it helpful for better understanding mental and chronic health conditions, but it's also useful if you just like tracking stuff. We don't sell your data, no "AI", etc. If it sounds interesting, please give it a try to help us pay our rent :)

https://exist.io