A phone-sensor-based reading of Angle of Trunk Rotation (ATR) during the Adams Forward Bend Test — the same quantity a manual scoliometer measures, taken for each curve region in turn.

This tool doesn't diagnose scoliosis and doesn't measure a Cobb angle. It needs the phone held flat and sideways against the back, which only works from the mobile app — a web browser can't read a phone's motion sensors this way.