HangTrue — Last updated: July 27, 2026
HangTrue measures the angle of the straight edges in a photo you choose, so you can tell whether a picture frame, shelf, blind or door frame is hung straight. Every measurement runs on your device. Your photos are never uploaded, and there is no account to create.
When you pick or take a photo, HangTrue reads it to measure the angle and holds it in memory while the result is on screen. It is not copied into the app's own storage, not written back to your library, not altered, and not sent anywhere. It is released when you start over or close the app. We never see it.
iOS asks your permission before HangTrue can open your photo library or use the camera. The library is used for one thing: letting you pick the photo you want measured. The camera is used for one thing: letting you shoot the edge straight into the app instead of switching to Camera first. HangTrue does not browse, index or upload your library, and does not save the photos you take.
We use Firebase Analytics for anonymized usage data (such as which screens are opened) and Sentry / Firebase Crashlytics for crash reports, so we can fix problems. Neither receives your photos or the angles measured from them, and neither identifies you.
The app shows ads via Google AdMob. AdMob may collect device identifiers to deliver and measure ads, in accordance with Google's privacy policy. On iOS we ask for your permission through Apple's App Tracking Transparency before any tracking. A one-time in-app purchase removes ads.
HangTrue is not directed to children under 13 and we do not knowingly collect personal information from children.
We may update this policy; changes are posted on this page.