Last updated: June 2026.
Hairline is built to be private by default. It does not collect, transmit, or store your personal information on any server. There is no account and no sign-up.
Progress photos are taken or chosen with your permission and are processed and stored only on your device. They are never uploaded to us or to anyone else. The camera and photo-library permissions are used solely to add photos to your on-device timeline.
Your Hairline Check answers, your estimated stage, and your routine are stored only on your device. If you delete the app, this data is removed with it.
No analytics, no advertising, no third-party trackers, and no SDKs that send your data elsewhere. We have no servers that receive your information.
Any optional purchase is handled by Apple through the App Store. We do not see or store your payment details. Apple's processing is governed by Apple's privacy policy.
Hairline is intended for adults and is not directed to children.
Questions about privacy: trendtweekers00@gmail.com.
Hairline is a tracking tool, not medical advice or a diagnosis.