# decimal3D vs CT

The clearest difference is rating: decimal3D at 5.0 against CT's 4.5. decimal3D also leads on ads (none vs shown) and update cadence (every 2 months vs every 12 months). CT's advantage is ratings volume (12 vs 3) and device support (3 vs 1). On price 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.

decimal3D holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 3 and 12 respectively.

decimal3D ships an update every 2 months, CT every 12 months. The most recent releases landed on October 6, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | decimal3D | CT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/decimal3d/id1471708895/reviews)** | [4.5 (12 ratings)](https://appshunter.io/ios/app/ct-computed-tomography/id1562592280/reviews) |
| Number of ratings | 3 | **12** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 12 months |
| Monetization | **Free** | Ad-supported |
| Size | 39 MB | 55 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [.decimal, LLC](https://appshunter.io/developer/1471708894) | [Fabricio Tarter](https://appshunter.io/developer/1533271635) |

## What reviewers say

### decimal3D

[App page](https://appshunter.io/ios/app/decimal3d/id1471708895)

This medical software helps radiation therapy professionals design and order patient-specific devices for external beam radiation therapy. It captures 3D renderings of treatment areas and allows for quick digitization and design of electron apertures, with one-click ordering for next-day delivery.

**Highlights:** 3D patient treatment area capture, Digitize and design electron apertures, One-click ordering for custom devices, FDA cleared medical software, Streamlined radiation therapy workflow

**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 decimal3D free?

decimal3D is free to download, with no in-app purchases.

### Is CT free?

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

### Which has better reviews, decimal3D or CT?

decimal3D is rated higher. decimal3D averages 5.0 out of 5 from 3 ratings, while CT averages 4.5 from 12 ratings.

### Do decimal3D or CT have ads?

CT shows ads; decimal3D does not.

### Which is updated more often, decimal3D or CT?

decimal3D ships an update every 2 months, and CT every 12 months. Most recently, decimal3D was updated on October 6, 2026 and CT on October 16, 2026.

---

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