What heart-rate data can reveal
- Your routine: when you wake, sleep, commute and exercise.
- Stress: which days and situations raise your heart rate.
- Health changes: illness, pregnancy or medication often shift resting heart rate.
- Private moments that you would rather not have logged by anyone but you.
The heart rate app privacy checklist
| Question | Where to check |
|---|---|
| Does it upload my data? | Description and privacy policy. Test it: does it work in airplane mode? |
| What does it collect? | The App Privacy card on the App Store listing |
| Does it need an account? | First launch. An account usually means a server. |
| Which permissions does it ask for? | Settings › Privacy & Security › Health |
| Can I delete my data? | Privacy policy; for on-device apps, deleting the app is enough |
The airplane mode test
The simplest privacy check needs no reading at all. Put your phone in airplane mode and use the app. Anything that still works is being done on the phone. If the charts disappear, the app depends on a server.
Apple's rules
Apple does not allow apps to use HealthKit data for advertising or sell it to data brokers, and any app that uses HealthKit must have a privacy policy. That is a floor that applies to every app, not a feature of any one of them.
How 70 BPM handles it
70 BPM is on-device by design. It reads heart rate from Apple Health and events from your calendar and draws the chart on your iPhone. There is no account and no cloud upload. You can check this yourself with the airplane mode test. You can remove its Health access at any time in Settings without deleting anything.
The full method for testing any app is in heart rate app that does not upload to the cloud.