Private health apps — what "Data Not Collected" really means
Short answer: The most private health apps work without an account, process data on your device, use no third-party analytics, and show "Data Not Collected" on their App Store privacy label. Cloud AI coaches, social features and account sync all mean your health data is stored on someone else's servers.
Five things to check
| Check | Most private | Less private |
|---|---|---|
| Account | None needed | Email or social login |
| Processing | On-device | Uploaded to company servers |
| AI coach | On-device model | Cloud LLM (your data sent per question) |
| Analytics | None | Third-party SDKs |
| App Store label | Data Not Collected | Data Linked to You |
Read the App Store privacy label
Every app on the App Store shows a privacy label. “Data Not Collected” means the developer says the app doesn’t collect any data from it. “Data Linked to You” means data is tied to your identity. Read it before you grant Apple Health access.
Cloud AI is a privacy trade-off
Most AI health coaches send your history to a cloud language model with every question. That’s useful, but it means your health data leaves your phone. On-device models, like Apple Intelligence’s Foundation Models, can answer questions without sending anything. See on-device AI health coach.
How Pulse Coach is built
No account. No servers. No analytics or ad SDKs. Scores and AI answers are calculated on your iPhone. Your journal is stored only on your device, and you can delete it any time. Read the privacy policy.
Questions people also ask
Is Apple Health data private?
Apple Health data is encrypted on your device. When you grant an app access, that app can read it, and what happens next depends on the app's own practices. Check its privacy label and policy.
Do health apps sell data?
Some have shared health data with advertisers in the past, which has led to regulatory action. Apps that never collect your data can't share it.
Sources
Not medical advice. This article is general information about wellness metrics. It is not a diagnosis or a substitute for professional care. If a reading worries you, or you feel unwell, talk to a doctor.