Comparison

ContrastRx vs CTisus CT Quick Guides

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

CTisus CT Quick Guides

This medical reference app provides radiologists and other healthcare professionals with curated CT images, imaging pearls, and clinical findings across 17 diverse topics. Key information is organized into critical findings, etiology, epidemiology, presentation, and prognosis for each subject.

Highlights
  • Curated CT images
  • Imaging pearls
  • Clinical findings
  • 17 topic sections
  • Critical CT findings
  • Etiology, epidemiology, presentation, prognosis
Features
Read full description

CTisus CT Quick Guides is a unique application that combines select CT images with imaging pearls and important clinical findings across a range of topics important to the radiologist and other medical professionals. The topics are varied and divided into 17 unique sections ranging from the adrenal gland to the vascular system. In each section there are multiple topics ranging from infectious and inflammatory disease to oncology. In each section key information is divided into subsections including  the critical CT findings, etiology, epidemiology, presentation and prognosis. We will continue to expand these modules which have won praise from our users especially as they are shared on our social media pages. Please let us know what additional topics you would like covered and any feedback on how we can improve the application. We hope you find it an important educational experience.

Screenshots

ContrastRx4 screens
CTisus CT Quick Guides4 screens

Verdict

The call

The clearest difference is update cadence: ContrastRx at every 3 weeks against CTisus CT Quick Guides's every 6 months. CTisus CT Quick Guides's advantage is rating (4.8 vs 4.4). 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

CTisus CT Quick Guides holds the better App Store score, 4.8 against 4.4. Both are backed by a comparable volume of ratings — 9 and 4 respectively.

UpkeepUpdate frequency

ContrastRx ships an update every 3 weeks, CTisus CT Quick Guides every 6 months. The most recent releases landed on September 28, 2026 and September 19, 2026 respectively.

Scorecard2 real differences · 8 level
ContrastRx versus CTisus CT Quick Guides: the parameters behind the verdict, then further details
ParameterContrastRxCTisus CT Quick Guides
PriceFreeFree
Rating4.4 (9 ratings)4.8 (4 ratings) — better
Positive reviews50.0% of reviews—
Number of ratings9 — better4
Update frequencyEvery 3 weeks — betterEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.616.6
Further details — not scored
Size9 MB52 MB
Age rating17+17+
DeveloperMayo ClinicElliot Fishman

Customer experience

ContrastRx

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

CTisus CT Quick Guides

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

ContrastRx

No in-app purchases

None

CTisus CT Quick Guides

No in-app purchases

Questions

Is ContrastRx free?
ContrastRx is free to download, with no in-app purchases.
Is CTisus CT Quick Guides free?
CTisus CT Quick Guides is free to download, with no in-app purchases.
Which has better reviews, ContrastRx or CTisus CT Quick Guides?
CTisus CT Quick Guides is rated higher. ContrastRx averages 4.4 out of 5 from 9 ratings, while CTisus CT Quick Guides averages 4.8 from 4 ratings.
Do ContrastRx or CTisus CT Quick Guides have ads?
Neither ContrastRx nor CTisus CT Quick Guides shows ads.
Which is updated more often, ContrastRx or CTisus CT Quick Guides?
ContrastRx ships an update every 3 weeks, and CTisus CT Quick Guides every 6 months. Most recently, ContrastRx was updated on September 28, 2026 and CTisus CT Quick Guides on September 19, 2026.

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