# AO Surgery Reference vs SpinopelvicBalanceApp

The clearest difference is price: AO Surgery Reference at Free against SpinopelvicBalanceApp's $8.99. AO Surgery Reference also leads on iOS requirement (13.0 vs 15.4). On update cadence, ads, in-app purchases and device support there is nothing between them.

AO Surgery Reference is free to download; SpinopelvicBalanceApp costs $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

AO Surgery Reference ships an update every 6 months, SpinopelvicBalanceApp every 9 months. The most recent releases landed on October 23, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | AO Surgery Reference | SpinopelvicBalanceApp |
| --- | --- | --- |
| Price | **Free** | $8.99 |
| 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 | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 9 months |
| Monetization | Free | — |
| Size | 1 MB | 1 MB |
| Requires iOS | **13.0** | 15.4 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 17+ |
| Developer | [AO Foundation](https://appshunter.io/developer/399757056) | [ORTHOPRACTIS.COM SINGLE MEMBER P.C.](https://appshunter.io/developer/1286360877) |

## 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


### SpinopelvicBalanceApp

[App page](https://appshunter.io/ios/app/spinopelvicbalanceapp/id1360640710)

**Features:** 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 SpinopelvicBalanceApp free?

SpinopelvicBalanceApp costs $8.99, with no in-app purchases.

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

Neither AO Surgery Reference nor SpinopelvicBalanceApp shows ads.

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

AO Surgery Reference ships an update every 6 months, and SpinopelvicBalanceApp every 9 months. Most recently, AO Surgery Reference was updated on October 23, 2026 and SpinopelvicBalanceApp on October 26, 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.*