Privacy
The short version: your health data never leaves your phone.
What Circadia reads
With your permission, Circadia reads health data from Apple Health, such as heart-rate variability, resting heart rate, sleep, breathing rate, wrist temperature, daylight time, steps, and workouts. This access is read-only and you can revoke it at any time in the Health app.
Where your data goes
Nowhere. All processing, scoring, and AI coaching happen on your device. Circadia does not upload your health data to any server, does not sell it, and does not use it for advertising. It is not stored in iCloud by Circadia.
On-device intelligence
Circadia's coaching uses Apple's on-device intelligence to rephrase results that are already computed from your own numbers. No prompts or data are sent to an external AI service.
Analytics and email
If you join the waitlist, your email address is used only to tell you when Circadia is available. Any product analytics, if added, are limited to anonymous, aggregate usage and never include your health data.
Contact
Questions about privacy? Email hello@circadia.app.
Circadia is a wellness app, not a medical device. It does not diagnose, treat, cure, or prevent any disease.