# ContrastRx vs ACR Guidance

The clearest difference is rating: ContrastRx at 4.4 against ACR Guidance's 3.1. ContrastRx also leads on review sentiment (50% vs 25%) and update cadence (every 3 weeks vs every 2 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ContrastRx holds the better App Store score, 4.4 against 3.1. Both are backed by a comparable volume of ratings — 9 and 12 respectively. Written reviews point the same way: 50% of ContrastRx's written reviews are positive against 25% of ACR Guidance's.

ContrastRx ships an update every 3 weeks, ACR Guidance every 2 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ContrastRx | ACR Guidance |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (9 ratings)](https://appshunter.io/ios/app/contrastrx/id619478666/reviews)** | [3.1 (12 ratings)](https://appshunter.io/ios/app/acr-guidance/id1484701466/reviews) |
| Number of ratings | 9 | **12** |
| Positive reviews | **50.0% of reviews** | 25.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 9 MB | 111 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Mayo Clinic](https://appshunter.io/developer/350350016) | [The American College of Radiology](https://appshunter.io/developer/493774954) |

## What reviewers say

### ContrastRx

[App page](https://appshunter.io/ios/app/contrastrx/id619478666)

Provides quick access to treatment regimens for life-threatening reactions to radiographic contrast agents. Includes clinical descriptions, visual examples, and treatment protocols, along with helpful calculators and information on nephrogenic systemic fibrosis.

**Highlights:** Treatment regimens for contrast reactions, Clinical descriptions and pictorial examples, eGFR calculator, Pediatric dose calculator, Steroid pretreatment regimens, Nephrogenic systemic fibrosis overview

**Features:** Vision Pro support

**In-app purchases:** none


### 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 ContrastRx free?

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

### Is ACR Guidance free?

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

### Which has better reviews, ContrastRx or ACR Guidance?

ContrastRx is rated higher. ContrastRx averages 4.4 out of 5 from 9 ratings, while ACR Guidance averages 3.1 from 12 ratings.

### Do ContrastRx or ACR Guidance have ads?

Neither ContrastRx nor ACR Guidance shows ads.

### Which is updated more often, ContrastRx or ACR Guidance?

ContrastRx ships an update every 3 weeks, and ACR Guidance every 2 months. Most recently, ContrastRx was updated on October 21, 2026 and ACR Guidance 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.*