# AO Surgery Reference vs BMI BSA Breast Reduction Calc

The clearest difference is rating: BMI BSA Breast Reduction Calc at 5.0 against AO Surgery Reference's 4.4. BMI BSA Breast Reduction Calc also leads on update cadence (every 6 weeks vs every 6 months) and review sentiment (100% vs 86%). AO Surgery Reference's advantage is ratings volume (14 vs 4). On price, ads, in-app purchases and monetization model there is nothing between them.

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

BMI BSA Breast Reduction Calc holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 14 and 4 respectively. Written reviews point the same way: 86% of AO Surgery Reference's written reviews are positive against 100% of BMI BSA Breast Reduction Calc's.

AO Surgery Reference ships an update every 6 months, BMI BSA Breast Reduction Calc every 6 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | AO Surgery Reference | BMI BSA Breast Reduction Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (14 ratings)](https://appshunter.io/ios/app/ao-surgery-reference/id403961165/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/bmi-bsa-breast-reduction-calc/id1468709857/reviews)** |
| Number of ratings | **14** | 4 |
| Positive reviews | 85.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 1 MB | 19 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [AO Foundation](https://appshunter.io/developer/399757056) | [Code Surgeon LLC](https://appshunter.io/developer/1468709856) |

## 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


### BMI BSA Breast Reduction Calc

[App page](https://appshunter.io/ios/app/bmi-bsa-breast-reduction-calc/id1468709857)

Calculate Body Surface Area, Body Mass Index, Ideal Body Weight, and Schnur Weight for breast reduction surgery. This tool assists medical professionals and patients in making informed decisions about surgical procedures and medical necessity.

**Highlights:** Body Surface Area calculation, Body Mass Index calculation, Ideal Body Weight calculation, Schnur Weight calculation, Physician-developed tool, Useful for breast reduction surgery

**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 BMI BSA Breast Reduction Calc free?

BMI BSA Breast Reduction Calc is free to download, with no in-app purchases.

### Which has better reviews, AO Surgery Reference or BMI BSA Breast Reduction Calc?

BMI BSA Breast Reduction Calc is rated higher. AO Surgery Reference averages 4.4 out of 5 from 14 ratings, while BMI BSA Breast Reduction Calc averages 5.0 from 4 ratings.

### Do AO Surgery Reference or BMI BSA Breast Reduction Calc have ads?

Neither AO Surgery Reference nor BMI BSA Breast Reduction Calc shows ads.

### Which is updated more often, AO Surgery Reference or BMI BSA Breast Reduction Calc?

AO Surgery Reference ships an update every 6 months, and BMI BSA Breast Reduction Calc every 6 weeks. Most recently, AO Surgery Reference was updated on November 1, 2026 and BMI BSA Breast Reduction Calc on November 3, 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.*