# Bone Age vs Skeletal Plan

The clearest difference is price: Skeletal Plan at Free against Bone Age's $7.99. Skeletal Plan also leads on update cadence (every 9 days vs every 3 months). Bone Age's advantage is iOS requirement (13.0 vs 15.5). On ads, in-app purchases and device support there is nothing between them.

Skeletal Plan is free to download; Bone Age costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Bone Age ships an update every 3 months, Skeletal Plan every 9 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Bone Age | Skeletal Plan |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[2.3 (3 ratings)](https://appshunter.io/ios/app/bone-age/id665745944/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | Paid | — |
| Size | 15 MB | 111 MB |
| Requires iOS | **13.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Simon Chapman](https://appshunter.io/developer/629291277) | [N2 Medical Ltd](https://appshunter.io/developer/6782600512) |

## What reviewers say

### Bone Age

[App page](https://appshunter.io/ios/app/bone-age/id665745944)

This medical app calculates bone age using the Tanner-Whitehouse method, offering TWII and TWIII references for 'RUS', 'TW20', and carpal scores directly in a clinical setting.

**Highlights:** Tanner-Whitehouse method calculation, TWII and TWIII references, RUS score calculation, TW20 score calculation, Carpal score calculation, In-clinic use

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Skeletal Plan

[App page](https://appshunter.io/ios/app/skeletal-plan/id6782600510)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Bone Age free?

Bone Age costs $7.99, with no in-app purchases.

### Is Skeletal Plan free?

Skeletal Plan is free to download, with no in-app purchases.

### Do Bone Age or Skeletal Plan have ads?

Neither Bone Age nor Skeletal Plan shows ads.

### Which is updated more often, Bone Age or Skeletal Plan?

Bone Age ships an update every 3 months, and Skeletal Plan every 9 days. Most recently, Bone Age was updated on November 1, 2026 and Skeletal Plan on October 31, 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.*