# AO Surgery Reference vs CJOrtho

The clearest difference is review sentiment: AO Surgery Reference at 86% against CJOrtho's 75%. AO Surgery Reference also leads on iOS requirement (13.0 vs 16.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 6 months. The most recent releases landed on October 11, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | AO Surgery Reference | CJOrtho |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (14 ratings)](https://appshunter.io/ios/app/ao-surgery-reference/id403961165/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | **85.8% of reviews** | 75.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | Every 6 months |
| Monetization | Free | Free |
| Size | 1 MB | 72 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [AO Foundation](https://appshunter.io/developer/399757056) | [Collège des Jeunes Orthopédistes](https://appshunter.io/developer/937704597) |

## What reviewers say

### AO Surgery Reference

[App page](https://appshunter.io/ios/app/ao-surgery-reference/id403961165)

Access a comprehensive online repository of surgical knowledge for fracture management. It provides detailed guidance on diagnosis, treatment, and aftercare for numerous fracture types, supported by extensive illustrations and expert review.

**Highlights:** 353 fracture types covered, 172 surgical approaches, 1222 surgical procedures, Over 30,000 illustrations, Feline, canine, and equine fracture care, Powerful search function

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### CJOrtho

[App page](https://appshunter.io/ios/app/cjortho/id937704598)

This medical app assists orthopedic surgeons and health professionals in managing patients with musculoskeletal disorders. It offers tools for clinical evaluation, decision support, and pre- and post-operative follow-up, including classifications, clinical scores, and a goniometer.

**Highlights:** Orthopedic classifications, Clinical scores by joint, Goniometer tool, Patient database, Procedure progress tracking, Pre- and post-operative follow-up

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is AO Surgery Reference free?

AO Surgery Reference is free to download, with no in-app purchases.

### Is CJOrtho free?

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

### Do AO Surgery Reference or CJOrtho have ads?

Neither AO Surgery Reference nor CJOrtho shows ads.

### Which is updated more often, AO Surgery Reference or CJOrtho?

AO Surgery Reference ships an update every 6 months, and CJOrtho every 6 months. Most recently, AO Surgery Reference was updated on October 11, 2026 and CJOrtho on October 3, 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.*