Comparison

ContrastRx vs ACR Guidance

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Treatment regimens for contrast reactions
  • Clinical descriptions and pictorial examples
  • eGFR calculator
  • Pediatric dose calculator
  • Steroid pretreatment regimens
  • Nephrogenic systemic fibrosis overview
Features
Read full description

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.

About

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.

Highlights
  • Interactive clinical guidance
  • ACR Contrast Reaction Cards
  • Reporting and Data Systems (RADS) content
  • Incidental Findings (IF) content
  • On-the-go reference materials
Features
Read full description

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

ContrastRx4 screens
ACR Guidance4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
ContrastRx versus ACR Guidance: the parameters behind the verdict, then further details
ParameterContrastRxACR Guidance
PriceFreeFree
Rating4.4 (9 ratings) — better3.1 (12 ratings)
Positive reviews50.0% of reviews — better25.0% of reviews
Number of ratings912 — better
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.615.0 — better
Further details — not scored
Size9 MB111 MB
Age rating17+17+
DeveloperMayo ClinicThe American College of Radiology

Customer experience

ContrastRx

All ratings9 ratings
Positive77.8%
Neutral11.1%
Negative11.1%
Written reviews4 reviews
Positive50.0%
Neutral25.0%
Negative25.0%

ACR Guidance

All ratings12 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

In-app purchases

None

ContrastRx

No in-app purchases

None

ACR Guidance

No in-app purchases

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.

Other comparisons