# CT Registry Test Pro vs Rad Tech Audio

The clearest difference is price: CT Registry Test Pro at Free against Rad Tech Audio's $107.99. CT Registry Test Pro also leads on update cadence (every 2 months vs every 39 months). Rad Tech Audio's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

CT Registry Test Pro is free to download; Rad Tech Audio costs $107.99 up front. CT Registry Test Pro sells 1 one-off in-app purchase. Rad Tech Audio asks for nothing beyond the download.

CT Registry Test Pro ships an update every 2 months, Rad Tech Audio every 39 months. The most recent releases landed on October 24, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | CT Registry Test Pro | Rad Tech Audio |
| --- | --- | --- |
| Price | **Free** | $107.99 |
| Rating | **[4.9 (214 ratings)](https://appshunter.io/ios/app/ct-registry-test-pro/id1518808012/reviews)** | — |
| Number of ratings | **214** | — |
| Positive reviews | 72.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 39 months |
| Monetization | Free with in-app purchases | — |
| Best chart rank | — | **#200** |
| Size | 93 MB | 214 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Edunorth L.L.C.](https://appshunter.io/developer/1496084172) | [RTS Publishing Co Inc](https://appshunter.io/developer/604916069) |

## What reviewers say

### CT Registry Test Pro

[App page](https://appshunter.io/ios/app/ct-registry-test-pro/id1518808012)

Prepare for your ARRT® Computed Tomography (CT) technologist certification exam with over 900 practice questions. Test your knowledge across key categories, review explanations, track your progress, and study protocols to strengthen your foundation.

**Highlights:** Over 900 practice questions, ARRT® registry format testing, Detailed answer explanations, Study notes section, Review previous tests, All questions with answers, Statistics tracking, CT protocol guidelines

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Access all the app features | $39.99 | one-time |


### Rad Tech Audio

[App page](https://appshunter.io/ios/app/rad-tech-audio/id6444367028)

**Currently charting:** #200 Top Paid · Education (US App Store)

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

**In-app purchases:** none


## Frequently asked questions

### Is CT Registry Test Pro free?

CT Registry Test Pro is free to download, with in-app purchases available.

### Is Rad Tech Audio free?

Rad Tech Audio costs $107.99, with no in-app purchases.

### Do CT Registry Test Pro or Rad Tech Audio have ads?

CT Registry Test Pro shows ads; Rad Tech Audio does not.

### Which is updated more often, CT Registry Test Pro or Rad Tech Audio?

CT Registry Test Pro ships an update every 2 months, and Rad Tech Audio every 39 months. Most recently, CT Registry Test Pro was updated on October 24, 2026 and Rad Tech Audio on October 15, 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.*