This policy applies to the Skinfold iOS app provided by WENTIAN ZHANG.
1. How data is processed
To estimate body fat percentage, the app processes the sex you select and the age and readings from three skinfold sites you enter on your device. It then generates a body fat percentage, reference category, and any retake guidance. The app writes the sex, age, sum of the three site averages, body fat percentage, category, and measurement date to local history only when you choose Save to history. Individual raw readings are not saved.
2. Data collection and sharing
None of this information is sent to the developer or third parties. The app has no accounts, ads, analytics, cloud sync, or remote services; it does not integrate with HealthKit and does not track you.
3. Delete data
You can delete an individual record on the History page, or choose Clear history to delete all history. History is excluded from system backups; deleting the app removes the remaining local data.
4. Website
This Privacy Policy and the support pages are static pages with no ads or analytics scripts. They are hosted on GitHub Pages, so GitHub may process network request information needed to provide and protect that service. Measurement data from the app is not sent to this website or to GitHub.
5. Updates and contact
If the way data is processed changes materially, the developer will update this policy, its effective date, and the App Store privacy information.
Developer: WENTIAN ZHANG. Email ywhdt_zh@outlook.com, or report an issue through GitHub Issues. Do not include unnecessary personal health information in an email or public issue.