# Radio Interactive vs CTisus CT Quick Guides

The clearest difference is iOS requirement: Radio Interactive at 13.0 against CTisus CT Quick Guides's 16.6. On price, update cadence, 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.

Radio Interactive ships an update every 4 months, CTisus CT Quick Guides every 6 months. The most recent releases landed on September 14, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | Radio Interactive | CTisus CT Quick Guides |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (4 ratings)](https://appshunter.io/ios/app/ctisus-ct-quick-guides/id6743173540/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 6 months |
| Monetization | — | Free |
| Size | 39 MB | 52 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Radio Interactive GmbH](https://appshunter.io/developer/1744814792) | [Elliot Fishman](https://appshunter.io/developer/399024444) |

## What reviewers say

### Radio Interactive

[App page](https://appshunter.io/ios/app/radio-interactive/id6502262078)

**In-app purchases:** none


### CTisus CT Quick Guides

[App page](https://appshunter.io/ios/app/ctisus-ct-quick-guides/id6743173540)

This medical reference app provides radiologists and other healthcare professionals with curated CT images, imaging pearls, and clinical findings across 17 diverse topics. Key information is organized into critical findings, etiology, epidemiology, presentation, and prognosis for each subject.

**Highlights:** Curated CT images, Imaging pearls, Clinical findings, 17 topic sections, Critical CT findings, Etiology, epidemiology, presentation, prognosis

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

**In-app purchases:** none


## Frequently asked questions

### Is Radio Interactive free?

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

### Is CTisus CT Quick Guides free?

CTisus CT Quick Guides is free to download, with no in-app purchases.

### Do Radio Interactive or CTisus CT Quick Guides have ads?

Neither Radio Interactive nor CTisus CT Quick Guides shows ads.

### Which is updated more often, Radio Interactive or CTisus CT Quick Guides?

Radio Interactive ships an update every 4 months, and CTisus CT Quick Guides every 6 months. Most recently, Radio Interactive was updated on September 14, 2026 and CTisus CT Quick Guides on September 6, 2026.

---

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