# AO Surgery Reference vs Bone Ninja

The clearest difference is price: AO Surgery Reference at Free against Bone Ninja's $49.99. AO Surgery Reference also leads on ratings volume (14 vs 3) and device support (3 vs 1). Bone Ninja's advantage is rating (4.7 vs 4.4) and iOS requirement (8.0 vs 13.0). On review sentiment, update cadence, ads and in-app purchases there is nothing between them.

AO Surgery Reference is free to download; Bone Ninja costs $49.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Bone Ninja holds the better App Store score, 4.7 against 4.4. Both are backed by a comparable volume of ratings — 14 and 3 respectively. Written reviews point the same way: 86% of AO Surgery Reference's written reviews are positive against 90% of Bone Ninja's.

AO Surgery Reference ships an update every 6 months, Bone Ninja every 4 months. The most recent releases landed on October 15, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | AO Surgery Reference | Bone Ninja |
| --- | --- | --- |
| Price | **Free** | $49.99 |
| Rating | [4.4 (14 ratings)](https://appshunter.io/ios/app/ao-surgery-reference/id403961165/reviews) | **[4.7 (3 ratings)](https://appshunter.io/ios/app/bone-ninja/id554151432/reviews)** |
| Number of ratings | **14** | 3 |
| Positive reviews | 85.8% of reviews | **90.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 4 months** |
| Monetization | **Free** | Paid |
| Size | 1 MB | 34 MB |
| Requires iOS | 13.0 | **8.0** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 17+ | 4+ |
| Developer | [AO Foundation](https://appshunter.io/developer/399757056) | [LifeBridge Health](https://appshunter.io/developer/460335164) |

## 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


### Bone Ninja

[App page](https://appshunter.io/ios/app/bone-ninja/id554151432)

This educational tool helps orthopedic surgeons learn to analyze and correct long bone deformities using digital radiographs. It provides tools for measurement, drawing, and simulating osteotomy solutions, based on established surgical methodology.

**Highlights:** Radiograph analysis of bone deformities, Digital measurement and drawing tools, Osteotomy simulation with cut-out tool, Upload and analyze personal radiographs, Comparison with suggested correction solutions, Educational tool based on established methodology

**Features:** macOS Compatibility

**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 Bone Ninja free?

Bone Ninja costs $49.99, with no in-app purchases.

### Which has better reviews, AO Surgery Reference or Bone Ninja?

Bone Ninja is rated higher. AO Surgery Reference averages 4.4 out of 5 from 14 ratings, while Bone Ninja averages 4.7 from 3 ratings.

### Do AO Surgery Reference or Bone Ninja have ads?

Neither AO Surgery Reference nor Bone Ninja shows ads.

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

AO Surgery Reference ships an update every 6 months, and Bone Ninja every 4 months. Most recently, AO Surgery Reference was updated on October 15, 2026 and Bone Ninja on October 1, 2026.

---

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