A private AI health coach built on your own data

The problem

A tracker and smart scale record sleep stages, heart-rate variability, resting heart rate, blood oxygen, weight, body fat, activity and more. The free app shows some of it, the in-depth analysis sits behind a subscription, and none of it connects the dots, like how last week's training affected this week's sleep. There's no way to ask it a question either.

What we built

1. Automatic sync every 10 minutes from the official Google Health API, including the full history. No phone app in the middle.
2. A dashboard with today's numbers against personal baselines, long-term trends, reports and plans.
3. A daily check-in and a weekly review, written by AI from the actual data and ready each morning and every Sunday.
4. A coach you can chat with. Ask "why was my sleep worse this week?" and it looks at the numbers before it answers.
5. Plans that are tracked. Goals for sleep, training or weight are saved, and progress is checked against the data, not against memory.

Screens

Screenshots use generated demo data.

How the AI is kept honest

• It can only read, never change. The coach's tools are read-only queries, pre-built summaries, and its own notes and plans.
• Numbers come from the database, not the model. Daily summaries and baselines are calculated in code and shared by the dashboard and the coach, so both always agree.
• It remembers context. The coach keeps notes and a journal, so advice builds on last week instead of starting fresh every time.

Private by design

• Your data lives on your server. The full health history is stored in a database on our own hardware, not in someone else's cloud app. The AI only sees the figures it looks up to answer a question.
• Locked down. It's reachable from anywhere but protected by its own login, and the first password can only be set from the home network.
• Nothing lost if a field changes. The raw data is kept, so if the provider changes a format, it's fixed and re-read without downloading anything again.