# AO Surgery Reference vs SagittalBalanceApp

The clearest difference is price: AO Surgery Reference at Free against SagittalBalanceApp's $8.99. AO Surgery Reference also leads on rating (4.4 vs 3.0) and ratings volume (14 vs 1). On update cadence, ads, in-app purchases and device support there is nothing between them.

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

AO Surgery Reference holds the better App Store score, 4.4 against 3.0. That said, the two scores are not equally well evidenced: AO Surgery Reference has 14 ratings behind it against 1, so its average is the more settled of the two.

AO Surgery Reference ships an update every 6 months, SagittalBalanceApp every 10 months. The most recent releases landed on October 23, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | AO Surgery Reference | SagittalBalanceApp |
| --- | --- | --- |
| Price | **Free** | $8.99 |
| Rating | **[4.4 (14 ratings)](https://appshunter.io/ios/app/ao-surgery-reference/id403961165/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/sagittalbalanceapp/id1353114137/reviews) |
| Number of ratings | **14** | 1 |
| Positive reviews | 85.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 10 months |
| Monetization | **Free** | Paid |
| 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


### SagittalBalanceApp

[App page](https://appshunter.io/ios/app/sagittalbalanceapp/id1353114137)

This medical app assists orthopedic surgeons by providing tools to analyze spinal alignment from X-ray images. It calculates key radiographic parameters, categorizes imbalance severity, and saves results for review and research. It streamlines the measurement process, offering a more convenient alternative to manual methods.

**Highlights:** Import medical images, Calculate radiographic parameters (PI, SS, PT, LL, etc.), Categorize spinal imbalance severity, Save and export measurement data, Calculate vertebral centroids, Compare measurements to reference databases

**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 SagittalBalanceApp free?

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

### Which has better reviews, AO Surgery Reference or SagittalBalanceApp?

AO Surgery Reference is rated higher. AO Surgery Reference averages 4.4 out of 5 from 14 ratings, while SagittalBalanceApp averages 3.0 from 1 ratings.

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

Neither AO Surgery Reference nor SagittalBalanceApp shows ads.

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

AO Surgery Reference ships an update every 6 months, and SagittalBalanceApp every 10 months. Most recently, AO Surgery Reference was updated on October 23, 2026 and SagittalBalanceApp on October 7, 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.*