# IMAIOS e vs GadCalc

The clearest difference is in-app purchases: GadCalc at none against IMAIOS e's 2. GadCalc also leads on iOS requirement (12.0 vs 16.6). IMAIOS e's advantage is update cadence (every 9 days vs every 18 months) and ratings volume (1.4K vs 2). On price, rating, ads and device support there is nothing between them.

Both are free to download. IMAIOS e sells 2 in-app purchases, starting at $21.99 per month. GadCalc asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for IMAIOS e against 5.0 for GadCalc. That said, the two scores are not equally well evidenced: IMAIOS e has 1.4K ratings behind it against 2, so its average is the more settled of the two.

IMAIOS e ships an update every 9 days, GadCalc every 18 months. The most recent releases landed on October 27, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | IMAIOS e | GadCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (1.4K ratings)](https://appshunter.io/ios/app/imaios-e-anatomy/id334876403/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/gadcalc/id1051070769/reviews)** |
| Number of ratings | **1.4K** | 2 |
| Positive reviews | 47.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 18 months |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#88** | — |
| Size | 2.1 GB | 9 MB |
| Requires iOS | 16.6 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [IMAIOS](https://appshunter.io/developer/334876406) | [University of Wisconsin-Madison Shared Apps](https://appshunter.io/developer/908478605) |

## What reviewers say

### IMAIOS e

[App page](https://appshunter.io/ios/app/imaios-e-anatomy/id334876403)

**Currently charting:** #88 Top Grossing · Medical (US App Store)

This comprehensive human anatomy atlas offers over 26,000 medical images, including various views and illustrations. It allows users to explore anatomical structures with interactive features and multiple language options. A free preview is available before subscribing to the full, continuously updated atlas.

**Highlights:** 26,000+ medical and anatomical images, Axial, coronal, sagittal views, Radiography and angiography images, Dissection pictures and illustrations, Interactive labeling and search, 12 language options

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| e-Anatomy monthly Subscription | $21.99 | per month |
| e-Anatomy one year Subscription | $132.99 | per year |


### GadCalc

[App page](https://appshunter.io/ios/app/gadcalc/id1051070769)

This medical app assists with calculating MRI contrast agent doses. It provides access to package inserts and lists standard and specific doses for FDA-approved agents. It's a convenient tool for healthcare professionals.

**Highlights:** Calculate MRI contrast agent dose, View contrast agent package inserts, Access online and offline inserts, Look up standard doses, Find University of Wisconsin specific doses

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

**In-app purchases:** none


## Frequently asked questions

### Is IMAIOS e free?

IMAIOS e is free to download, with in-app purchases available.

### Is GadCalc free?

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

### Which has better reviews, IMAIOS e or GadCalc?

GadCalc is rated higher. IMAIOS e averages 4.9 out of 5 from 1.4K ratings, while GadCalc averages 5.0 from 2 ratings.

### Do IMAIOS e or GadCalc have ads?

Neither IMAIOS e nor GadCalc shows ads.

### Which is updated more often, IMAIOS e or GadCalc?

IMAIOS e ships an update every 9 days, and GadCalc every 18 months. Most recently, IMAIOS e was updated on October 27, 2026 and GadCalc on September 29, 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.*