# iRadTech ESP vs CT

The clearest difference is price: CT at Free against iRadTech ESP's $9.99. iRadTech ESP's advantage is ads (none vs shown) and iOS requirement (11.0 vs 13.0). On update cadence, in-app purchases and device support there is nothing between them.

CT is free to download; iRadTech ESP costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iRadTech ESP ships an update every 24 months, CT every 12 months. The most recent releases landed on September 22, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | iRadTech ESP | CT |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[4.5 (12 ratings)](https://appshunter.io/ios/app/ct-computed-tomography/id1562592280/reviews)** |
| Number of ratings | — | **12** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 24 months | **Every 12 months** |
| Monetization | — | Ad-supported |
| Size | 95 MB | 55 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [Ballinger and Bruckner, LLP](https://appshunter.io/developer/692079862) | [Fabricio Tarter](https://appshunter.io/developer/1533271635) |

## What reviewers say

### iRadTech ESP

[App page](https://appshunter.io/ios/app/iradtech-esp/id563141602)

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

**In-app purchases:** none


### CT

[App page](https://appshunter.io/ios/app/ct-computed-tomography/id1562592280)

This app provides a didactic and effective way for students, radiologists, and bio-image graduates to learn and reinforce their knowledge of computed tomography protocols. It features a human body model with selectable protocols, detailing essential information for each study.

**Highlights:** Human body model for protocol selection, Detailed protocol information, Indications and preparation guidance, Scout view and FOV details, Cut thickness and gap information, Window settings and reconstruction plans, Protocol-specific images

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

**In-app purchases:** none


## Frequently asked questions

### Is iRadTech ESP free?

iRadTech ESP costs $9.99, with no in-app purchases.

### Is CT free?

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

### Do iRadTech ESP or CT have ads?

CT shows ads; iRadTech ESP does not.

### Which is updated more often, iRadTech ESP or CT?

iRadTech ESP ships an update every 24 months, and CT every 12 months. Most recently, iRadTech ESP was updated on September 22, 2026 and CT on September 9, 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.*