# DRU Classification vs AcetabularDepthRatioApp

The clearest difference is price: DRU Classification at Free against AcetabularDepthRatioApp's $4.99. DRU Classification also leads on iOS requirement (12.0 vs 16.6). AcetabularDepthRatioApp's advantage is update cadence (every 11 months vs every 29 months). On ads, in-app purchases and device support there is nothing between them.

DRU Classification is free to download; AcetabularDepthRatioApp costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DRU Classification ships an update every 29 months, AcetabularDepthRatioApp every 11 months. The most recent releases landed on November 11, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | DRU Classification | AcetabularDepthRatioApp |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 11 months** |
| Size | 28 MB | 1 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 17+ | 17+ |
| Developer | [Department of Orthopaedics and Traumatology, The University of Hong Kong](https://appshunter.io/developer/1208011315) | [ORTHOPRACTIS.COM SINGLE MEMBER P.C.](https://appshunter.io/developer/1286360877) |

## What reviewers say

### DRU Classification

[App page](https://appshunter.io/ios/app/dru-classification/id1208011316)

**Features:** macOS Compatibility

**In-app purchases:** none


### AcetabularDepthRatioApp

[App page](https://appshunter.io/ios/app/acetabulardepthratioapp/id1312655753)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is DRU Classification free?

DRU Classification is free to download, with no in-app purchases.

### Is AcetabularDepthRatioApp free?

AcetabularDepthRatioApp costs $4.99, with no in-app purchases.

### Do DRU Classification or AcetabularDepthRatioApp have ads?

Neither DRU Classification nor AcetabularDepthRatioApp shows ads.

### Which is updated more often, DRU Classification or AcetabularDepthRatioApp?

DRU Classification ships an update every 29 months, and AcetabularDepthRatioApp every 11 months. Most recently, DRU Classification was updated on November 11, 2026 and AcetabularDepthRatioApp on November 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*