What we access
Breezefit is an Android app. With your permission, given on Health Connect's own screen, it reads from Health Connect what your tracker's app (such as Fitbit or Samsung Health) keeps there: activity (steps, distance, floors, calories, workouts), vitals (heart rate, resting heart rate, heart rate variability, blood oxygen, breathing rate, skin temperature, VO₂ max), sleep sessions and stages, and body measurements (weight, height). If you log a weight or set your height, Breezefit writes that one entry to Health Connect. It reads your history, and reads in the background only to tell you about a new workout or night's sleep.
Where your data lives
Your data goes from Health Connect to Breezefit on your phone and is stored there, and on a computer only if you link one (below). Scores, zone minutes and trends are worked out on the phone. There's no account and no sign-in: Breezefit's server never receives your health data in a form it can read, and knows nothing about you.
Your year of birth, if you give it (for heart rate zones), stays on the phone. Your settings, notes and tags (never health data) are kept in a small file that Android's own backup saves to your Google account, so they come back on a new phone.
If you also turn on Google Drive backup, the phone saves that same file (preferences such as goals, layout and theme, and what you add in Breezefit: workout names, notes, effort and tags) to a hidden app folder in your own Google Drive. Only Breezefit can read that folder, and health measurements are never put there. Turn it off or delete the copy in Settings, or remove it under Drive → Settings → Manage apps.
Using Breezefit on a computer
This is optional. To link a computer, you open Breezefit's link page on it, scan its code with Breezefit on your phone, and confirm on the phone. The phone then sends that computer a copy of your data (health data, settings, and your notes and tags) so it can show it on a bigger screen.
Everything is encrypted on the phone, end to end, with keys made for that link. It travels through Breezefit's relay, which passes it along as it is: the relay can't read it and keeps no messages, no logs and no accounts. Like any server, it sees that a connection exists and the address it comes from.
On the computer, the copy is stored encrypted in the browser. The key that opens it stays on your phone: each time you open Breezefit on the computer, your phone asks you to allow it, and the browser tab forgets the key when it closes. Notes, workout names and tags you change on the computer go back to the phone. While Breezefit has focus on the computer, the phone keeps itself running to stay up to date, and shows a notification while it does. The computer view has no analytics.
You can unlink a computer at any time, from the phone or the computer. Its copy is deleted, and the phone deletes the key, so a copy left behind can't be opened. A computer not used for 30 days unlinks itself.
Notifications
Notifications for new workouts and sleep are optional: you can turn them off at any time in Settings → Privacy & permissions. The phone checks Health Connect itself and makes them there, without a server.
Analytics
Breezefit uses Google Analytics to count visits and which pages are opened (not on a linked computer). It runs without cookies and receives only the page's path (such as /app/sleep) — never health data, the questions you ask, dates or anything else from a page's address. Google may use your IP address to estimate a rough location; it is not stored by Breezefit.
What we never do
We do not sell or share your data, use it for advertising or credit, or allow humans to read it. Breezefit uses Health Connect data only to show you your own health and fitness. Its use of information received from Google APIs (Google Drive, for backup) adheres to the Google API Services User Data Policy, including the Limited Use requirements.
Your controls
You can take back any permission in Health Connect at any time (Settings → Privacy & permissions → Health Connect). In Settings you can export everything stored on the phone, or delete it; uninstalling Breezefit deletes it too.
Not medical advice
Breezefit is a general wellness app, not a medical device. Its scores are estimates and not a diagnosis.