# AO Surgery Reference vs Ortho AI

The clearest difference is in-app purchases: AO Surgery Reference at none against Ortho AI's 1. AO Surgery Reference also leads on iOS requirement (13.0 vs 16.4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Ortho AI sells 1 in-app purchase, starting at $14.99 per month. AO Surgery Reference asks for nothing beyond the download.

AO Surgery Reference ships an update every 6 months, Ortho AI every 4 months. The most recent releases landed on September 24, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | AO Surgery Reference | Ortho AI |
| --- | --- | --- |
| 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 | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 4 months** |
| Monetization | **Free** | Freemium |
| Size | 1 MB | 62 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [AO Foundation](https://appshunter.io/developer/399757056) | [CLINICAL ARTIFICIAL INTELLIGENCE MEDI DECISIONS PRIVATE LIMITED](https://appshunter.io/developer/1859397943) |

## 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


### Ortho AI

[App page](https://appshunter.io/ios/app/ortho-ai-aimd/id6756233109)

This AI-powered assistant provides evidence-based orthopedic information for healthcare professionals and students. It offers specialized AI agents, literature discovery, and customizable chat responses with PubMed references.

**Highlights:** 11 specialized AI agents, Evidence-based answers with PubMed references, AI-powered chat with customizable styles, Medical literature discovery, Offline support, Professional, intuitive interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OrthoAI Pro | $14.99 | per month |


## Frequently asked questions

### Is AO Surgery Reference free?

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

### Is Ortho AI free?

Ortho AI is free to download, with in-app purchases available.

### Do AO Surgery Reference or Ortho AI have ads?

Neither AO Surgery Reference nor Ortho AI shows ads.

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

AO Surgery Reference ships an update every 6 months, and Ortho AI every 4 months. Most recently, AO Surgery Reference was updated on September 24, 2026 and Ortho AI on September 17, 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.*