# Bone Age vs Calcium Correction

The clearest difference is price: Calcium Correction at Free against Bone Age's $7.99. Calcium Correction also leads on rating (5.0 vs 2.3). Bone Age's advantage is update cadence (every 3 months vs every 8 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

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

Calcium Correction holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 5 respectively.

Bone Age ships an update every 3 months, Calcium Correction every 8 months. The most recent releases landed on September 10, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Bone Age | Calcium Correction |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/bone-age/id665745944/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/calcium-correction/id1456114059/reviews)** |
| Number of ratings | 3 | **5** |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 8 months |
| Monetization | Paid | **Free** |
| Size | 15 MB | 18 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Simon Chapman](https://appshunter.io/developer/629291277) | [DOCTOT](https://appshunter.io/developer/351335901) |

## 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


### Calcium Correction

[App page](https://appshunter.io/ios/app/calcium-correction/id1456114059)

This medical calculator assists endocrinology specialists and general medics in adjusting calcium readings based on albumin levels. It offers a guided 'wizard' format for intuitive use, aiming to improve accuracy, efficiency, and patient safety in assessment and treatment protocols.

**Highlights:** Albumin-based calcium adjustment, Guided 'wizard' format, Patient results management, Data transfer options, Integrated information sections, Touch ID and PIN protection

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Bone Age free?

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

### Is Calcium Correction free?

Calcium Correction is free to download, with no in-app purchases.

### Which has better reviews, Bone Age or Calcium Correction?

Calcium Correction is rated higher. Bone Age averages 2.3 out of 5 from 3 ratings, while Calcium Correction averages 5.0 from 5 ratings.

### Do Bone Age or Calcium Correction have ads?

Neither Bone Age nor Calcium Correction shows ads.

### Which is updated more often, Bone Age or Calcium Correction?

Bone Age ships an update every 3 months, and Calcium Correction every 8 months. Most recently, Bone Age was updated on September 10, 2026 and Calcium Correction on June 1, 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.*