Nothing. PHVD does not collect, store, transmit, or sell personal data.
Any clinical measurements you enter are processed entirely on your device and are never uploaded. They are stored locally on the device so your series persists between sessions, and are removed when you clear the history or delete the app.
PHVD is an educational and reference tool for qualified healthcare professionals. It is not a medical device, does not provide a diagnosis, and does not replace clinical assessment or local protocols. It is not directed at children.
If a future version of the app sends any data off the device, this policy and the App Store privacy disclosures will be updated before that version ships.
The same tool runs as a web app, with no install and no account: open the PHVD web app. It works offline once loaded, and everything you enter stays on your own device.