Hinge Protractor
Read your physical hinge angle
Free
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!
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Support iPhone Duo angle sensor
- Add pixel ruler
The developer, Maksim Tatarchenkov, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Maksim Tatarchenkov
- Size
- 5.9 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
English and 2 more
- English, Russian, Simplified Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Maksim Tatarchenkov