# Bone Ninja vs AcetabularIndex

The clearest difference is price: AcetabularIndex at $2.99 against Bone Ninja's $49.99. AcetabularIndex also leads on rating (5.0 vs 4.7) and device support (4 vs 1). Bone Ninja's advantage is update cadence (every 4 months vs every 11 months) and ratings volume (3 vs 1). On ads, in-app purchases and monetization model there is nothing between them.

Bone Ninja costs $49.99 and AcetabularIndex $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

AcetabularIndex holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Bone Ninja ships an update every 4 months, AcetabularIndex every 11 months. The most recent releases landed on June 4, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Bone Ninja | AcetabularIndex |
| --- | --- | --- |
| Price | $49.99 | **$2.99** |
| Rating | [4.7 (3 ratings)](https://appshunter.io/ios/app/bone-ninja/id554151432/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/acetabularindex/id1292735334/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 90.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 11 months |
| Monetization | Paid | Paid |
| Size | 34 MB | 1 MB |
| Requires iOS | **8.0** | 15.4 |
| Devices | iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [LifeBridge Health](https://appshunter.io/developer/460335164) | [ORTHOPRACTIS.COM SINGLE MEMBER P.C.](https://appshunter.io/developer/1286360877) |

## What reviewers say

### Bone Ninja

[App page](https://appshunter.io/ios/app/bone-ninja/id554151432)

This educational tool helps orthopedic surgeons learn to analyze and correct long bone deformities using digital radiographs. It provides tools for measurement, drawing, and simulating osteotomy solutions, based on established surgical methodology.

**Highlights:** Radiograph analysis of bone deformities, Digital measurement and drawing tools, Osteotomy simulation with cut-out tool, Upload and analyze personal radiographs, Comparison with suggested correction solutions, Educational tool based on established methodology

**Features:** macOS Compatibility

**In-app purchases:** none


### AcetabularIndex

[App page](https://appshunter.io/ios/app/acetabularindex/id1292735334)

This medical software assists orthopedic surgeons in evaluating hip dysplasia by measuring the acetabular index from X-rays. It simplifies angle measurement, compares results to normal reference values based on patient age, sex, and side, and categorizes hip dysplasia.

**Highlights:** Import medical images from camera or photos, Accurate angle measurement with a circular template, Automatic angle calculation and display in degrees, Comparison with normal reference database, Categorization of hip dysplasia (mild/severe), Save images for later review

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Bone Ninja free?

Bone Ninja costs $49.99, with no in-app purchases.

### Is AcetabularIndex free?

AcetabularIndex costs $2.99, with no in-app purchases.

### Which has better reviews, Bone Ninja or AcetabularIndex?

AcetabularIndex is rated higher. Bone Ninja averages 4.7 out of 5 from 3 ratings, while AcetabularIndex averages 5.0 from 1 ratings.

### Do Bone Ninja or AcetabularIndex have ads?

Neither Bone Ninja nor AcetabularIndex shows ads.

### Which is updated more often, Bone Ninja or AcetabularIndex?

Bone Ninja ships an update every 4 months, and AcetabularIndex every 11 months. Most recently, Bone Ninja was updated on June 4, 2026 and AcetabularIndex on September 20, 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.*