# ContrastRx vs Radiology Core

The clearest difference is price: ContrastRx at Free against Radiology Core's $9.99. ContrastRx also leads on rating (4.4 vs 2.9) and update cadence (every 3 weeks vs every 6 months). Radiology Core's advantage is chart position (#89 vs unranked) and ratings volume (50 vs 9). On ads, in-app purchases and device support there is nothing between them.

ContrastRx is free to download; Radiology Core costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ContrastRx holds the better App Store score, 4.4 against 2.9. That said, the two scores are not equally well evidenced: Radiology Core has 50 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 50% of ContrastRx's written reviews are positive against 24% of Radiology Core's.

ContrastRx ships an update every 3 weeks, Radiology Core every 6 months. The most recent releases landed on September 14, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | ContrastRx | Radiology Core |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[4.4 (9 ratings)](https://appshunter.io/ios/app/contrastrx/id619478666/reviews)** | [2.9 (50 ratings)](https://appshunter.io/ios/app/radiology-core-physics-plus/id1225040758/reviews) |
| Number of ratings | 9 | **50** |
| Positive reviews | **50.0% of reviews** | 23.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#89** |
| Size | 9 MB | 25 MB |
| Requires iOS | 16.6 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Mayo Clinic](https://appshunter.io/developer/350350016) | [Lieu Duong](https://appshunter.io/developer/1657425589) |

## 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


### Radiology Core

[App page](https://appshunter.io/ios/app/radiology-core-physics-plus/id1225040758)

**Currently charting:** #89 Top Paid · Medical (US App Store)

Prepare for the Radiology Core Exam's physics section with a premium resource. Access over 500 board-relevant questions with detailed explanations, covering all modalities and noninterpretive skills. The app is continually updated with new content to enhance your study time.

**Highlights:** Comprehensive physics review, Over 500 board-relevant questions, Full explanation for each question, Covers all modalities, Includes noninterpretive skills, Continually updated content

**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 Radiology Core free?

Radiology Core costs $9.99, with no in-app purchases.

### Which has better reviews, ContrastRx or Radiology Core?

ContrastRx is rated higher. ContrastRx averages 4.4 out of 5 from 9 ratings, while Radiology Core averages 2.9 from 50 ratings.

### Do ContrastRx or Radiology Core have ads?

Neither ContrastRx nor Radiology Core shows ads.

### Which is updated more often, ContrastRx or Radiology Core?

ContrastRx ships an update every 3 weeks, and Radiology Core every 6 months. Most recently, ContrastRx was updated on September 14, 2026 and Radiology Core on September 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.*