Protractor°: Angle Finder
Measure on paper and surfaces
About
This app transforms your iPhone Duo into a digital protractor. Measure angles on paper or between surfaces by simply folding the device to match the desired angle and reading the degrees. Save and organize your measurements for later use.
What's New in Protractor°
1.2
October 23, 2026
° Measure, save angles and view History on the outer screen. ° Keep your angle and controls together in landscape.
Subscriptions & In-App Purchases
$3.99
Protractor Lifetime Access
One payment. Protractor is yours for life.
Developer apps
FAQ
What devices does Protractor° work on?
Protractor° is specifically designed for iPhone Duo models and requires iOS 27.1 or later. Measurement functionality relies on the phone's folding hinge and is not available on other devices.
How accurate is Protractor°?
The app's accuracy depends on the precision of the iPhone Duo's hinge and how well the user aligns the device with the angle being measured. User reviews indicate a high level of satisfaction with a 5.0-star rating.
Can I save my angle measurements with Protractor°?
Yes, Protractor° allows you to record and save your angle readings. These saved measurements are grouped by day in the history section, showing the time of each reading.
How do I delete saved measurements in Protractor°?
You can delete individual angle readings directly from the history section or clear all saved measurements at once within the app's interface.
Is Protractor° free to use?
Protractor° is available for free. There are no upfront costs to download or use the core angle measurement features.
Does Protractor° have ads?
No, Protractor° does not contain advertisements. The app is ad-free, providing an uninterrupted user experience.
How often is Protractor° updated?
The app was last updated on October 23, 2026, with version 1.2. This indicates a recent update, suggesting ongoing support and potential for future improvements.
What is the age rating for Protractor°?
Protractor° has an age rating of 4+, making it suitable for a wide range of users, including children and adults.
