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

Exist

By combining data from services you already use, we can help you understand what makes you more happy, productive, and active.

We also make https://changemap.co, which is a public roadmap tool for folks who like to involve their users and take suggestions to shape future development, etc. We use it for our own apps.
changemap

Changemap helps teams keep users updated on internal progress.

Oh! There's also https://foreground.computer, which is an activity tracker for your Windows personal computer, tracking time in apps and sites you use each day. Totally private and offline, everything's in a sqlite db you can search yourself. Optionally integrates with Exist if you use both.
Foreground — productive time tracking for Windows

Foregound is a programme for your Windows personal computer that tracks your time in applications and web sites.

@Joshsharp hey thanks! I'll probably enroll in a bit, we absolutely love working with users!