AngleDuoAngleDuo
Help
Find answers and a quick guide to the controls here.
Which devices are supported?
Inclination and spirit level work on iPhone and iPad with iOS 17 or later. Hinge measurement is designed for iPhone Duo with iOS 27.1.
How accurate is AngleDuo?
Display resolution is not verified measurement accuracy. An accuracy specification will follow tests on real hardware. Browser demos illustrate the features.
What happens to my data?
Measurements and preferences stay on your device. No account or developer tracking. Apple handles optional purchases. See Privacy for app and website details.
What does AngleDuo cost?
The spirit level and inclination tools stay free. The angle finder includes 5 free measurements in total, shared by hinge and two-surface measurement. A held hinge reading or a completed two-surface result counts as one; your final free reading remains visible. After that, AngleDuo Pro unlocks unlimited angle measurements for a €4.99 one-time purchase, including target angles and relative zero. No subscription or automatic charge. Purchases can be restored.
Controls
Tap the reading to hold or release it. The tools menu contains measurement modes and Pro tools. The gear opens Settings and Help. Sequential two-surface measurement is in Settings.
Two surfaces, one after another.
Without a hinge, capture the first surface and compare it with a second. Find the guided steps in Settings. The shared edge must be horizontal.
Availability
AngleDuo is not yet publicly available on the App Store. This website shows the current development version, including Duo features. Hardware accuracy has not yet been verified.