ContrastRx vs ACR Guidance
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ContrastRx
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.
- Treatment regimens for contrast reactions
- Clinical descriptions and pictorial examples
- eGFR calculator
- Pediatric dose calculator
- Steroid pretreatment regimens
- Nephrogenic systemic fibrosis overview
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This app provides quick access to treatment regimens for potentially life-threatening reactions that can occur with iodine or gadolinium radiographic contrast. Included are clinical descriptions, pictorial examples, sound clips, and treatment regimens for the various types of reactions. Also included are a pediatric dose calculator, an eGFR calculator, a self-assessment module, pretreatment medication regimens, and an overview of nephrogenic systemic fibrosis.
ACR Guidance
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.
- Interactive clinical guidance
- ACR Contrast Reaction Cards
- Reporting and Data Systems (RADS) content
- Incidental Findings (IF) content
- On-the-go reference materials
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The ACR® Guidance App provides interactive mobile access to select clinical guidance content from the ACR website. Download to access the ACR Contrast Reaction Cards, Reporting and Data Systems (RADS), and Incidental Findings (IF) content. This app is intended for healthcare professionals such as radiologists, oncologists, referring physicians, and medical students who desire on the go reference materials from ACR. This app is not a medical device and should not be considered as one. ACR provides this mobile app for reference purposes only. It is not intended to substitute for the independent clinical judgment of a physician or other health care professional user. A physician or other user is solely responsible for verifying the currency and applicability of app content to a particular clinical situation and thus assumes all risk of use. As allowable under applicable law, ACR and ACR’s employees, officers, directors, agents, contractors and volunteers will not be liable for any damages arising out of the use or misuse of the app, its content, or calculations. This includes but is not limited to a user’s inability to access the app or any loss or corruption of a user’s data.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ContrastRx | ACR Guidance |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (9 ratings) — better | 3.1 (12 ratings) |
| Positive reviews | 50.0% of reviews — better | 25.0% of reviews |
| Number of ratings | 9 | 12 — better |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 111 MB |
| Age rating | 17+ | 17+ |
| Developer | Mayo Clinic | The American College of Radiology |
Customer experience
ContrastRx
ACR Guidance
In-app purchases
ContrastRx
No in-app purchases
ACR Guidance
No in-app purchases
Questions
Is ContrastRx free?
Is ACR Guidance free?
Which has better reviews, ContrastRx or ACR Guidance?
Do ContrastRx or ACR Guidance have ads?
Which is updated more often, ContrastRx or ACR Guidance?
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