Hinge Protractor vs Fold Angle

Hinge Protractor for iPhone Duo: Forgot your protractor to school? Want a measure an angle at construction? Tracing a pattern and need a glowing guide line under the paper? Use the app on Duo! On iPhone Duo, it reads the hinge sensor and shows the exact angle between the two screens as you fold. On any other iPhone, the whole screen becomes a ruler at true physical size. FEATURES: - Live angle: Fold or tilt and watch the number follow in real time. - Resizable measurements: Pinch, twist and drag the reading anywhere on screen. - Honest precision: one-time calibration: open and close the hinge slowly, once. - Real-size ruler: Rulers along the screen edges show true physical size in centimetres or inches. Check them against any bank card for perfect accuracy. - Relative measurments: Drag two lines across the screen and read the exact position off both rulers. - Saved measurements: Double-tap to save an angle, a ruler position or both. Add a note, drag to reorder, and undo with one tap. - Configuration: Degrees or radians, centimeters or inches, light or dark theme, in English, Russian or Chinese.

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.