# IMAIOS e vs ACR Guidance

The clearest difference is rating: IMAIOS e at 4.9 against ACR Guidance's 3.1. IMAIOS e also leads on update cadence (every 9 days vs every 2 months) and ratings volume (1.4K vs 12). ACR Guidance's advantage is in-app purchases (none vs 2) and iOS requirement (15.0 vs 17.6). On price, 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. ACR Guidance asks for nothing beyond the download.

IMAIOS e holds the better App Store score, 4.9 against 3.1. That said, the two scores are not equally well evidenced: IMAIOS e has 1.4K ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 48% of IMAIOS e's written reviews are positive against 25% of ACR Guidance's.

IMAIOS e ships an update every 9 days, ACR Guidance every 2 months. The most recent releases landed on November 10, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | IMAIOS e | ACR Guidance |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (1.4K ratings)](https://appshunter.io/ios/app/imaios-e-anatomy/id334876403/reviews)** | [3.1 (12 ratings)](https://appshunter.io/ios/app/acr-guidance/id1484701466/reviews) |
| Number of ratings | **1.4K** | 12 |
| Positive reviews | **47.9% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#151** | — |
| Size | 2.1 GB | 111 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [IMAIOS](https://appshunter.io/developer/334876406) | [The American College of Radiology](https://appshunter.io/developer/493774954) |

## What reviewers say

### IMAIOS e

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

**Currently charting:** #151 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 |


### ACR Guidance

[App page](https://appshunter.io/ios/app/acr-guidance/id1484701466)

Access clinical guidance content from the ACR on your mobile device. Includes resources for contrast reactions, reporting systems, and incidental findings. Designed for healthcare professionals needing on-the-go reference materials.

**Highlights:** Interactive clinical guidance, ACR Contrast Reaction Cards, Reporting and Data Systems (RADS) content, Incidental Findings (IF) content, On-the-go reference materials

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is IMAIOS e free?

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

### Is ACR Guidance free?

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

### Which has better reviews, IMAIOS e or ACR Guidance?

IMAIOS e is rated higher. IMAIOS e averages 4.9 out of 5 from 1.4K ratings, while ACR Guidance averages 3.1 from 12 ratings.

### Do IMAIOS e or ACR Guidance have ads?

Neither IMAIOS e nor ACR Guidance shows ads.

### Which is updated more often, IMAIOS e or ACR Guidance?

IMAIOS e ships an update every 9 days, and ACR Guidance every 2 months. Most recently, IMAIOS e was updated on November 10, 2026 and ACR Guidance on November 3, 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.*