I’m working on Reflect [0], it’s a private self discovery and self experimentation app. You can track metrics, set goals, get alerted to anomalies, view correlations, visualize your data, etc.
I make Reflect with my partner. I do it on the side, they do it fully. It’s a private, local-first app to track and analyze your own personal data and run N=1 experiments.
[0] https://apps.apple.com/us/app/reflect-track-anything/id64638...