# ContrastRx vs OSTRICH

ContrastRx and OSTRICH are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

ContrastRx ships an update every 3 weeks, OSTRICH monthly. Both last shipped on November 3, 2026.

## The numbers

| Metric | ContrastRx | OSTRICH |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (9 ratings)](https://appshunter.io/ios/app/contrastrx/id619478666/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free | — |
| Size | 9 MB | 13 MB |
| Requires iOS | 16.6 | **16.5** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Mayo Clinic](https://appshunter.io/developer/350350016) | [The National Institute of Neurological Disorders and Stroke](https://appshunter.io/developer/1447332177) |

## 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


### OSTRICH

[App page](https://appshunter.io/ios/app/ostrich-offlinedatacollection/id1587270551)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ContrastRx free?

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

### Is OSTRICH free?

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

### Do ContrastRx or OSTRICH have ads?

Neither ContrastRx nor OSTRICH shows ads.

### Which is updated more often, ContrastRx or OSTRICH?

ContrastRx ships an update every 3 weeks, and OSTRICH monthly. Most recently, ContrastRx was updated on November 3, 2026 and OSTRICH on November 3, 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.*