---
title: "OP Calc - Reviews, Revenue and Downloads in Taiwan | Apple App Store"
description: "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 obli"
---

# OP Calc — Taiwan

![OP Calc App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/85/1e/0d/851e0d62-0ce3-ec46-569d-ca03eee02b44/AppIcon-0-0-1x_U007emarketing-0-11-0-85-220.png/434x0w.png)

**Developer:** [Chu An Luo](https://apptail.io/developer/chu-an-luo-sBxb) (Belgium)
**Category:** Medical
**Rating:** N/A (0 ratings)
**Price:** Free
**Bundle ID:** com.robers.ObliquePlaneCalculator
**Store:** Apple App Store
**Country:** Taiwan
**Version:** 1.0 (released 2026-07-21)
**Original Release:** 2026-07-21
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/tw/app/app/id6790341961)
**AppTail Page:** [https://apptail.io/app/op-calc-NllB/taiwan](https://apptail.io/app/op-calc-NllB/taiwan)

## OP Calc Description
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

## OP Calc Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/30/81/17/3081171d-2cfa-ce3a-42e7-3f4b388607d1/iPhone-6.5-01-result-light.jpg/1242x2688.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/23/bc/bc/23bcbc00-50bd-dfc1-e33e-6221f642f1e5/iPhone-6.5-02-result-dark.jpg/1242x2688.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/cc/78/e3/cc78e35d-d45c-af19-4131-bc4b140da215/iPhone-6.5-03-directional-result-dark.jpg/1242x2688.png)




## OP Calc Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Paid | Taiwan | Medical | #9 |
| Top Grossing | Taiwan | Medical | #85 |




---

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