Fold Protractor: Angle Finder
Spirit Level & Measuring Tool
Only for iPhone
$2.99
iPhone
Read the hinge angle on iPhone Duo. On any iPhone, use the level and the cm and inch rulers down both edges. Set a target and the screen turns green.
Fold Protractor turns iPhone Duo into a bevel gauge. Open the phone, set it into a corner or against two edges, and read the hinge angle in big numbers.
• Inside or outside angle
• Hold to freeze the reading
• Calibrate at flat (180°) or at 90°
• Haptic ticks every 45°
• Target: pick an angle. The screen is red until you reach it, then green.
On every other iPhone, and on a folded Duo, it works as a level. Stand the phone on an edge to read its rotation, or lay it flat to see the surface tilt with a bubble. Lock sets the current angle as zero, so you can measure from any edge.
In level mode, rulers run down both long edges: centimeters on the left, inches on the right. They count from the top of the phone itself, not the screen, and are set for each iPhone model from Apple's published measurements. On iPhone Duo, open the phone and rulers also run along the long edges of the inner display: inches on top, centimeters below.
• Turn off Lock Ruler to Edge in Settings, hold a finger on a ruler, and slide the phone to measure things longer than the phone.
• Adjust Rulers lines the marks up with a real ruler or tape, for a case or a small error. Touch and hold for a magnifier.
Readings and ruler marks are approximate. Phones and cases vary. For work that must be exact, check against a real tool.
Pay once. No ads. No subscription. No account. Nothing leaves your phone.
Built for iPhone Duo. Works on every iPhone.
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The developer, Special Glasses LLC, 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 Collected
The developer does not collect any data from this app.
Accessibility
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Information
- Seller
- Special Glasses LLC
- Size
- 6.5 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later.
- iPhone
- Languages
English and 11 more
- English, Arabic, Dutch, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Special Glasses LLC
