AngleDuo – Protractor

Inclination, level and miter

Free · In-App Purchases · Designed for iPad. Not verified for macOS.

Measure angles with the hinge on iPhone Duo. Level and two-surface measurement on iPhone and iPad. No account, ads or tracking. Two surfaces. One angle. On iPhone Duo, AngleDuo uses the hinge to measure the angle between two surfaces. Position the two halves against the surfaces and read the result. Hold the value with a tap or enable automatic capture, which waits for two seconds of stable readings. A held value stays available when you close the phone. On other iPhones and iPads, measure two surfaces in sequence: capture the first, then move the same device edge to the second. The shared edge must be horizontal; this gravity-based method cannot measure a corner between vertical walls. On Duo, sequential measurement is available in Settings. The level measures with the device resting on its back or standing on an edge. A moving shadow and a fixed scale show the tilt. Placement can be selected in Settings, where you can also find slope and roof-pitch values. “Per cut” gives the saw setting for two equal miter cuts. An interior angle of 112° gives 34° per cut; 0° means a square cut. Find it on Duo’s supplementary inner pane or in Settings. The spirit level is free. The angle finder includes 5 free measurements; after that, the one-time AngleDuo Pro purchase unlocks it without limit. Measure angles without limit, with the hinge and on any iPhone. Also includes target angles with tolerance and relative zero. Optional Pro purchases and restoration are handled by Apple through StoreKit. The app checks the purchase entitlement on your device. We do not receive your payment details. The number of free angle measurements used is counted on your device in the Keychain; it is not transmitted and is not reset by deleting local data. Deleting local measurements does not cancel a purchase.

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    Information

    Size
    4.1 MB
    Category
    Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 6 more
    • English, French, German, Italian, Japanese, Simplified Chinese, Spanish
    Age Rating
    4+
    In-App Purchases
    Yes
    Provider
    Julian Zefferer
    • Julian Zefferer has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
    • Address
      Müllerstr. 29
      13353 Berlin
      Germany
    • Phone Number
      +49 15231970610
    • Email
      hello@julianzett.com
    Copyright
    © 2026 Julian Zefferer
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