# AO Surgery Reference vs ISNCSCI Algorithm

AO Surgery Reference and ISNCSCI Algorithm are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

AO Surgery Reference ships an update every 6 months, ISNCSCI Algorithm every 3 months. The most recent releases landed on October 7, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | AO Surgery Reference | ISNCSCI Algorithm |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 1 MB | 10 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [AO Foundation](https://appshunter.io/developer/399757056) | [Praxis Spinal Cord Institute](https://appshunter.io/developer/980028790) |

## 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


### ISNCSCI Algorithm

[App page](https://appshunter.io/ios/app/isncsci-algorithm/id6476418908)

**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 ISNCSCI Algorithm free?

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

### Do AO Surgery Reference or ISNCSCI Algorithm have ads?

Neither AO Surgery Reference nor ISNCSCI Algorithm shows ads.

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

AO Surgery Reference ships an update every 6 months, and ISNCSCI Algorithm every 3 months. Most recently, AO Surgery Reference was updated on October 7, 2026 and ISNCSCI Algorithm on September 22, 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.*