Fold Angle vs FoldMetry

Your folding iPhone already knows how far it's open. Fold Angle turns the hinge into a protractor. Set the phone into a corner, against a door, or over the edge of a box, and read the angle between the two halves in degrees. Tap once to hold a reading, then lift the phone away and read what it captured. Set any angle as zero to compare two corners, or to measure how far a door swings. A light tap every 15° and a firm one at exactly 90°, so you can feel square without looking. Built for iPhone Duo. On other iPhones it works as a tilt meter using the motion sensors. No ads, no tracking, no data collected. For quick everyday checks rather than calibrated precision work.

Open your iPhone Duo. See the angle at a glance. FoldMetry puts the current hinge angle front and center. The number moves as your device opens and closes, with a clean display that stays out of your way. Have a position in mind? Set a target angle and feel a gentle tap when you reach it. Save more than one for the angles you use often. The app follows your device’s Light or Dark appearance, and measurements stay on your device. All measuring features are free. If FoldMetry earns a spot in your day, you can leave a one-time tip to support its independent development. Tips don’t unlock extra features. Hinge angle measurement is available only on iPhone Duo. Other iPhones and iPad can view device support information but cannot measure hinge angles.