# CTisus 10 Minute ER Challenge vs RadCS

The clearest difference is update cadence: RadCS at every 11 days against CTisus 10 Minute ER Challenge's every 4 months. RadCS also leads on iOS requirement (12.0 vs 15.6). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.9 for CTisus 10 Minute ER Challenge against 5.0 for RadCS. Both are backed by a comparable volume of ratings — 15 and 8 respectively.

CTisus 10 Minute ER Challenge ships an update every 4 months, RadCS every 11 days. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | CTisus 10 Minute ER Challenge | RadCS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (15 ratings)](https://appshunter.io/ios/app/ctisus-10-minute-er-challenge/id1154587260/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/radcs/id1641535536/reviews)** |
| Number of ratings | **15** | 8 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 11 days** |
| Monetization | Free | Free |
| Size | 24 MB | 67 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Elliot Fishman](https://appshunter.io/developer/399024444) | [Versive Inc](https://appshunter.io/developer/1641535538) |

## What reviewers say

### CTisus 10 Minute ER Challenge

[App page](https://appshunter.io/ios/app/ctisus-10-minute-er-challenge/id1154587260)

This app offers a timed challenge for medical professionals to interpret emergency radiology images. Users diagnose 60 CT cases within 10 minutes, with a 10-second limit per diagnosis before the answer is revealed. It's designed to evaluate and improve knowledge of emergency imaging.

**Highlights:** 60 emergency CT cases, 10-minute diagnostic challenge, 10-second diagnosis per case, Radiology image interpretation, Knowledge evaluation tool

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

**In-app purchases:** none


### RadCS

[App page](https://appshunter.io/ios/app/radcs/id1641535536)

Provides quick access to essential measurements and numbers used in radiology practice. Serves as a mini-textbook for medical professionals. Content is curated by board-certified radiologists.

**Highlights:** Radiology measurements lookup, Mini-textbook format, Curated by expert radiologists, Regular updates, Educational purposes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CTisus 10 Minute ER Challenge free?

CTisus 10 Minute ER Challenge is free to download, with no in-app purchases.

### Is RadCS free?

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

### Which has better reviews, CTisus 10 Minute ER Challenge or RadCS?

RadCS is rated higher. CTisus 10 Minute ER Challenge averages 4.9 out of 5 from 15 ratings, while RadCS averages 5.0 from 8 ratings.

### Do CTisus 10 Minute ER Challenge or RadCS have ads?

Neither CTisus 10 Minute ER Challenge nor RadCS shows ads.

### Which is updated more often, CTisus 10 Minute ER Challenge or RadCS?

CTisus 10 Minute ER Challenge ships an update every 4 months, and RadCS every 11 days. Most recently, CTisus 10 Minute ER Challenge was updated on November 2, 2026 and RadCS on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*