Read the fold as an angle when compatible hinge data is available, and keep a numeric measurement record.
Check a shelf or a DIY angle, then keep the reading. FoldAngle puts a large numeric display beside a graduated scale, with Hold and Record close at hand.
On a standard device, rest the long edge against a surface to read level and inclination, or align two adjustable rays over the camera preview. Where compatible hinge data is available, read the internal hinge angle too.
Calibrate against a known reference, switch between degrees and radians, and retain dated numeric records on your device. References are 0°, 90° and 180°; the level uses 0° or 90°. Camera images are never saved.
Readings are approximate: placement and camera perspective affect accuracy. Requires iOS 17 or later. USD4.99 paid upfront, with no ads, subscriptions, additional purchases or account registration.