Stud Finder Wall Wood Detector

Response from developer

Sorry to hear it didn't work for you. The app uses the phone's magnetometer to detect the metal screws and nails that hold drywall to the studs, so it needs a calibration away from any metal, the phone flat against the wall, a slow pass and a sensitivity setting that suits your wall; it is weaker on lath-and-plaster walls. Subscriptions are managed by Apple: Settings → your name → Subscriptions lets you cancel in two taps, and refund requests go through reportaproblem.apple.com. If you tell us what kind of wall you scanned, we're happy to help.