# CTisus iPearls vs RadCS

The clearest difference is update cadence: RadCS at every 11 days against CTisus iPearls's every 6 months. RadCS also leads on rating (5.0 vs 4.7) and iOS requirement (12.0 vs 15.6). CTisus iPearls's advantage is ratings volume (41 vs 6). On price, review sentiment, 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.

RadCS holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: CTisus iPearls has 41 ratings behind it against 6, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

CTisus iPearls ships an update every 6 months, RadCS every 11 days. The most recent releases landed on October 21, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | CTisus iPearls | RadCS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (41 ratings)](https://appshunter.io/ios/app/ctisus-ipearls/id687350624/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/radcs/id1641535536/reviews)** |
| Number of ratings | **41** | 6 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 11 days** |
| Monetization | Free | Free |
| Size | 137 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 iPearls

[App page](https://appshunter.io/ios/app/ctisus-ipearls/id687350624)

This app provides diagnostic radiologists with valuable insights and facts, known as "pearls," to aid in correct diagnoses and understanding of radiologic images. It organizes these pearls across 28 popular categories and includes a search feature for easy access to thousands of pieces of knowledge.

**Highlights:** Diagnostic radiology pearls, Thousands of insights, 28 popular categories, Search functionality, Radiologic image understanding

**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 iPearls free?

CTisus iPearls 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 iPearls or RadCS?

RadCS is rated higher. CTisus iPearls averages 4.7 out of 5 from 41 ratings, while RadCS averages 5.0 from 6 ratings.

### Do CTisus iPearls or RadCS have ads?

Neither CTisus iPearls nor RadCS shows ads.

### Which is updated more often, CTisus iPearls or RadCS?

CTisus iPearls ships an update every 6 months, and RadCS every 11 days. Most recently, CTisus iPearls was updated on October 21, 2026 and RadCS on October 10, 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.*