# CongruenceIndexApp vs Bone Ninja Sensei

The clearest difference is price: Bone Ninja Sensei at Free against CongruenceIndexApp's $0.99. Bone Ninja Sensei also leads on update cadence (every 3 months vs every 9 months) and iOS requirement (11.4 vs 18.6). CongruenceIndexApp's advantage is in-app purchases (none vs 1) and device support (3 vs 1). On ads there is nothing between them.

Bone Ninja Sensei is free to download; CongruenceIndexApp costs $0.99 up front. Bone Ninja Sensei sells 1 in-app purchase, starting at $14.99 per year. CongruenceIndexApp asks for nothing beyond the download.

CongruenceIndexApp ships an update every 9 months, Bone Ninja Sensei every 3 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | CongruenceIndexApp | Bone Ninja Sensei |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/bone-ninja-sensei/id6450483301/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 25.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 months** |
| Monetization | — | Free with in-app purchases |
| Size | 1 MB | 48 MB |
| Requires iOS | 18.6 | **11.4** |
| Devices | **iPhone, iPad, Mac** | iPad |
| Age rating | 17+ | 4+ |
| Developer | [ORTHOPRACTIS.COM SINGLE MEMBER P.C.](https://appshunter.io/developer/1286360877) | [LifeBridge Health](https://appshunter.io/developer/460335164) |

## What reviewers say

### CongruenceIndexApp

[App page](https://appshunter.io/ios/app/congruenceindexapp/id1316760196)

**Features:** Vision Pro support

**In-app purchases:** none


### Bone Ninja Sensei

[App page](https://appshunter.io/ios/app/bone-ninja-sensei/id6450483301)

This educational tool, created by orthopedic surgeons, helps medical professionals learn to analyze long bone deformities. It provides tools for drawing, measuring, and simulating osteotomy solutions on provided or uploaded radiographs.

**Highlights:** Analyze long bone deformities, Radiograph analysis tools, Simulate osteotomy solutions, Upload custom radiographs, Drawing and measuring tools, Educational case examples

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Subscription Plan | $14.99 | per year |


## Frequently asked questions

### Is CongruenceIndexApp free?

CongruenceIndexApp costs $0.99, with no in-app purchases.

### Is Bone Ninja Sensei free?

Bone Ninja Sensei is free to download, with in-app purchases available.

### Do CongruenceIndexApp or Bone Ninja Sensei have ads?

Neither CongruenceIndexApp nor Bone Ninja Sensei shows ads.

### Which is updated more often, CongruenceIndexApp or Bone Ninja Sensei?

CongruenceIndexApp ships an update every 9 months, and Bone Ninja Sensei every 3 months. Most recently, CongruenceIndexApp was updated on October 29, 2026 and Bone Ninja Sensei on October 24, 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.*