OP Calc

Oblique-Plane Calculator

$0.99 · Designed for iPad. Not verified for macOS.

Convert Coronal (AP) and Lateral (LAT) angulations into real deformity angle in the oblique plane , with a directional reference diagram. Oblique Plane Calculator is an offline angle-conversion utility. Enter sagittal (LAT) and coronal (AP) angles to calculate the oblique-plane angle (OBL) and the Alpha angle (the angle between the oblique plane and coronal plane). Features • Calculate OBL and Alpha angles from LAT and AP angulation • Set left or right side and anterior/posterior and medial/lateral directions • View a dynamic diagram of the OBL vector and Alpha angle • Light and dark appearance • No account, no data collection, and offline use

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The developer, Chu An Luo, 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

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    Accessibility

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    Information

    Seller
    Chu An Luo
    Size
    2.5 MB
    Category
    Medical
    Compatibility
    Requires iOS 17.6 or later.
    • iPhone
      Requires iOS 17.6 or later.
    • iPad
      Requires iPadOS 17.6 or later.
    • Mac
      Requires macOS 14.6 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.3 or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2026 Robers
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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