# Paley Growth vs Bone Ninja Sensei

Paley Growth and Bone Ninja Sensei both sit at 3.7 stars, but that hides the real split: 100% of Paley Growth's written reviews are positive against 25% of Bone Ninja Sensei's. Paley Growth also leads on in-app purchases (none vs 1) and device support (3 vs 1). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Bone Ninja Sensei sells 1 in-app purchase, starting at $14.99 per year. Paley Growth asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.7 for Paley Growth against 3.7 for Bone Ninja Sensei. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews are what separate them: 100% of Paley Growth's written reviews are positive against 25% of Bone Ninja Sensei's.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Paley Growth | Bone Ninja Sensei |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/paley-growth/id435195238/reviews) | [3.7 (3 ratings)](https://appshunter.io/ios/app/bone-ninja-sensei/id6450483301/reviews) |
| Number of ratings | 3 | 3 |
| Positive reviews | **100.0% of reviews** | 25.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 27 MB | 48 MB |
| Requires iOS | **9.0** | 11.4 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 12+ | 4+ |
| Developer | [Eric Townsend](https://appshunter.io/developer/435195241) | [LifeBridge Health](https://appshunter.io/developer/460335164) |

## What reviewers say

### Paley Growth

[App page](https://appshunter.io/ios/app/paley-growth/id435195238)

This medical app uses the Paley Multiplier method to predict a patient's height and limb length at maturity. It calculates predictions for congenital and developmental discrepancies, and can determine the age for epiphysiodesis for desired correction. The app also predicts standing and sitting height in normals and achondroplasia, as well as foot length and fetal bone length.

**Highlights:** Paley Multiplier method for predictions, Predicts limb length at maturity, Calculates epiphysiodesis age, Predicts standing and sitting height, Includes foot length and fetal bone predictions, References multiplier growth charts

**Features:** macOS Compatibility

**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 Paley Growth free?

Paley Growth is free to download, with no in-app purchases.

### Is Bone Ninja Sensei free?

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

### Which has better reviews, Paley Growth or Bone Ninja Sensei?

Paley Growth and Bone Ninja Sensei are both rated 3.7 out of 5 on the App Store, from 3 and 3 ratings respectively.

### Do Paley Growth or Bone Ninja Sensei have ads?

Neither Paley Growth nor Bone Ninja Sensei shows ads.

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

Paley Growth ships an update every 3 months, and Bone Ninja Sensei every 3 months. Most recently, Paley Growth 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.*