# Head vs CT

The clearest difference is ads: Head at none against CT's shown. CT's advantage is update cadence (every 12 months vs every 33 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

Head ships an update every 33 months, CT every 12 months. The most recent releases landed on October 1, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Head | CT |
| --- | --- | --- |
| Price | Free | 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 33 months | **Every 12 months** |
| Monetization | — | Ad-supported |
| Size | 231 MB | 55 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Simed Software SL](https://appshunter.io/developer/508339032) | [Fabricio Tarter](https://appshunter.io/developer/1533271635) |

## What reviewers say

### Head

[App page](https://appshunter.io/ios/app/head-us-app/id1438508524)

**Features:** macOS Compatibility

**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 Head free?

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

### Is CT free?

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

### Do Head or CT have ads?

CT shows ads; Head does not.

### Which is updated more often, Head or CT?

Head ships an update every 33 months, and CT every 12 months. Most recently, Head was updated on October 1, 2026 and CT on October 16, 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.*