Ah, with this comment I found the Health kit (https://developer.apple.com/health-fitness/) which would suggest that if I had my own app, then it could do everything on its own it seems. Good stuff! Source: about 1 year ago

Your smartwatch knows your exact body functions, knows when you exercise, fall, sit too long (for whatever reason 💩) or are experiencing stress. All of this data is available through the respective apps or a central app on your platform, e.g. HealthKit on iOS. - Source: dev.to / almost 2 years ago

Apple has HealthKit for apps. Maybe start there? Https://developer.apple.com/health-fitness/. Source: over 2 years ago

For example, Apple's HealthKit is an app for Apple devices that provides users with a centralized view of health and fitness data tracked over time on their iPhones or iPods. It allows the data to be shared among different apps so you can see how various factors influence your overall health. - Source: dev.to / over 2 years ago

Why does it have to be a web app? It does not meet your requirements, but when I looked into this sort of task before, the best option looked like Gramps [0], which was discussed at [1].

  [0] https://gramps-project.org.

- Source: Hacker News / 8 months ago

Is there a reason to prefer Webtrees over an open source desktop app like Gramps? https://gramps-project.org/. - Source: Hacker News / 11 months ago

My technique is to maintain my tree off line in Gramps and do online work in the always free FamilySearch. Source: over 1 year ago

Alternatively, there's Gramps (free): https://gramps-project.org/. Source: over 1 year ago

I think you are looking for Gramps. Source: over 1 year ago