Fitbit Health · last updated 2026-07-28
Fitbit Health is a single-user personal health dashboard, built and operated by Chris Wijnia for his own use. It is not a public product. It does not accept sign-ups from the general public. Access is restricted to a small, explicit allowlist of Google accounts.
With your Google sign-in, this app reads your Fitbit data via the Google Health API: activity, heart rate, HRV, respiratory rate, SpO2, sleep, and related fitness metrics tied to your Google account. It does not access email, contacts, files, or any other Google data.
Fetched metrics are cached in a private SQLite database on a single Cloud Run instance
(Google Cloud project fitbit-cwdx), accessible only to signed-in, allowlisted accounts.
Nothing is sold, shared, or used for advertising. Chat messages and AI-generated coaching
notes are stored the same way, for the same reason: so you can see your own history the next
time you open the app.
Two optional AI features, a weekly insight summary and a chat panel, send a snapshot of your recent metrics to Anthropic's API to generate text. No data goes anywhere else. If this isn't configured or is unavailable, those features are simply hidden. Nothing else in the app depends on them.
Data persists as long as the app is deployed and in active use. This is a private, single-operator tool, not a public service, so there is no self-service account deletion flow. Data questions or deletion requests go through the app owner directly.