# ContrastRx vs Radiology Calculators

The clearest difference is review sentiment: Radiology Calculators at 100% against ContrastRx's 50%. Radiology Calculators also leads on rating (5.0 vs 4.4). ContrastRx's advantage is in-app purchases (none vs 3). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Radiology Calculators sells 3 in-app purchases, starting at $3.99 per month. ContrastRx asks for nothing beyond the download.

Radiology Calculators holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 9 and 6 respectively. Written reviews point the same way: 50% of ContrastRx's written reviews are positive against 100% of Radiology Calculators's.

ContrastRx ships an update every 3 weeks, Radiology Calculators every 2 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | ContrastRx | Radiology Calculators |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (9 ratings)](https://appshunter.io/ios/app/contrastrx/id619478666/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/radiology-calculators/id6751121064/reviews)** |
| Number of ratings | **9** | 6 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | **Free** | Freemium |
| Size | 9 MB | 61 MB |
| Requires iOS | 16.6 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Mayo Clinic](https://appshunter.io/developer/350350016) | [Rad At Hand](https://appshunter.io/developer/1793832609) |

## 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 Calculators

[App page](https://appshunter.io/ios/app/radiology-calculators/id6751121064)

This app provides radiologists with over 30 essential interactive tools for calculations and reporting. It offers fast, accurate, and easy-to-use calculators to streamline workflow and enhance diagnostic confidence, all available offline.

**Highlights:** 30+ essential radiology calculators, Reporting tools, Offline access, Favorites and reordering, Streamlined workflow, Enhanced diagnostic confidence

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Access (1 Month) | $3.99 | per month |
| Pro Access (1 Year) | $39.99 | per year |
| Pro Access (Lifetime) | $149.99 | one-time |


## Frequently asked questions

### Is ContrastRx free?

ContrastRx is free to download, with no in-app purchases.

### Is Radiology Calculators free?

Radiology Calculators is free to download, with in-app purchases available.

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

Radiology Calculators is rated higher. ContrastRx averages 4.4 out of 5 from 9 ratings, while Radiology Calculators averages 5.0 from 6 ratings.

### Do ContrastRx or Radiology Calculators have ads?

Neither ContrastRx nor Radiology Calculators shows ads.

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

ContrastRx ships an update every 3 weeks, and Radiology Calculators every 2 weeks. Most recently, ContrastRx was updated on November 3, 2026 and Radiology Calculators on October 30, 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.*