Diedro Angle Finder & Level
Protractor, Clinometer, Ruler
Only for iPhone
Free · In‑App Purchases
iPhone
Open iPhone Duo against a corner and read the angle. On any other iPhone: a bubble level, a corner gauge and a true-scale ruler. No ads, no account.
Diedro measures angles with the hinge of iPhone Duo: open the phone against a corner and read the angle between its two halves. On any other iPhone it is a bubble level, a corner gauge and a true-scale ruler. No ads, no account.
ON iPHONE DUO: THE HINGE IS THE INSTRUMENT
• Measure. The interior angle, with its exterior, its supplement and the miter saw setting that joins two pieces in that corner.
• Square. Color and a tap tell you when you reach 90°, 45° and the usual workshop angles.
• Target. Pick an angle and be guided to it: how far, and which way. Use it to transfer an angle: measure it, save it, make it the target.
• Two-plane level. With the Duo folded, one half rests on the base and the other rises against the slope: you read both at once.
• A true-scale ruler whose zero is the fold.
• Hold and Auto hold. The reading freezes as soon as it is steady, so you can take the phone off the work and read it.
• A log of saved readings, and hinge calibration.
• Nearly closed, it keeps measuring on the cover display, with Hold and Save under your thumbs; shut, it shows the last reading.
ON ANY iPHONE
• Bubble level. Lying flat, on two axes, or standing on its edge; in degrees and percent of slope. It zeroes in two positions, like a real level.
• Corner gauge. Rest the back of the iPhone on one face of a corner, then on the other: the turn between the two rests is the corner, with its exterior, its supplement and the miter saw setting. Two walls, a floor and a wall, the bevel of a blade.
• True-scale ruler in millimeters or inches (decimals and fractions). Check it with a bank card: the long side is 85.6 mm.
Measure, Square and Target read the hinge angle, so they only appear on iPhone Duo. Nothing is simulated on other iPhones.
DIEDRO PRO
On iPhone Duo, the live angle, the level and the ruler work without Diedro Pro. Diedro Pro unlocks the workshop tools: Hold and Auto hold, the Log, Square, Target, the two-plane level, calibration, and the correction for the camera and the case. Pay once and keep it for good, or subscribe by the month; the subscription renews automatically until you cancel it. Both are shared with Family Sharing. On other iPhones nothing is locked.
HONEST ABOUT PRECISION
Diedro shows the resolution the sensor really delivers and never adds decimals that are not there. It is a handy instrument, not a certified one: check anything that matters against a tool you trust.
PRIVACY
No ads, no account, no tracking. The readings you save stay on your iPhone. Apple handles the purchase; RevenueCat checks its status without identifying you.
Privacy policy: https://roberib.github.io/legal/diedro/
Terms of use (Apple's standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The cover display now measures. From about 85° closed you keep the live angle, change mode and press Hold and Save without opening the Duo; shut, it shows the last steady reading, now free for everyone. Reaching a target is felt and seen: a firm tap and a green flash. New in Diedro Pro: Camera on the face corrects the reading for the camera holding its half off the work, and calibration takes a square with the case on. The hinge reading now follows every move without lag.
The developer, ROBERTO INSUA BRANDARIZ, 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:
- Purchases
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- ROBERTO INSUA BRANDARIZ
- Size
- 9.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later.
- iPhone
- Languages
English and 21 more
- English, Catalan, Danish, Dutch, Finnish, French, German, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Simplified Chinese, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Diedro Pro Monthly $7.99
- Diedro Pro $29.99
- Copyright
- © 2026 Roberto Insua Brandariz
