# ContrastRx vs CTisus CT Quick Guides

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.

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

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.

ContrastRx ships an update every 3 weeks, CTisus CT Quick Guides every 6 months. The most recent releases landed on October 13, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | ContrastRx | CTisus CT Quick Guides |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (9 ratings)](https://appshunter.io/ios/app/contrastrx/id619478666/reviews) | **[4.8 (4 ratings)](https://appshunter.io/ios/app/ctisus-ct-quick-guides/id6743173540/reviews)** |
| Number of ratings | **9** | 4 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Monetization | Free | Free |
| Size | 9 MB | 52 MB |
| Requires iOS | 16.6 | 16.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Mayo Clinic](https://appshunter.io/developer/350350016) | [Elliot Fishman](https://appshunter.io/developer/399024444) |

## 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


### CTisus CT Quick Guides

[App page](https://appshunter.io/ios/app/ctisus-ct-quick-guides/id6743173540)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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 October 13, 2026 and CTisus CT Quick Guides on October 8, 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.*