# CT Exam Prep for ARRT vs CT Registry Compass

The clearest difference is update cadence: CT Registry Compass at every 5 days against CT Exam Prep for ARRT's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. CT Exam Prep for ARRT sells 4 in-app purchases, starting at $6.99 per 7 days and CT Registry Compass sells 2 in-app purchases, starting at $24.99 per month. Whichever you choose, the download price is not the number that matters.

CT Exam Prep for ARRT ships an update every 3 months, CT Registry Compass every 5 days. The most recent releases landed on October 28, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | CT Exam Prep for ARRT | CT Registry Compass |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Size | 24 MB | 44 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FLY SKY PTY LTD](https://appshunter.io/developer/1838696534) | [MADEHA LLC](https://appshunter.io/developer/1896719453) |

## What reviewers say

### CT Exam Prep for ARRT

[App page](https://appshunter.io/ios/app/ct-exam-prep-for-arrt/id6779027261)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CT Tech Weekly | $6.99 | per 7 days |
| CT Tech Monthly | $16.99 | per month |
| CT Tech Yearly | $39.99 | per year |
| CT Tech Lifetime | $79.99 | one-time |


### CT Registry Compass

[App page](https://appshunter.io/ios/app/ct-registry-compass/id6780705003)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CT Registry Prep Monthly | $24.99 | per month |
| CT Registry Prep Annual | $59.99 | per year |


## Frequently asked questions

### Is CT Exam Prep for ARRT free?

CT Exam Prep for ARRT is free to download, with in-app purchases available.

### Is CT Registry Compass free?

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

### Do CT Exam Prep for ARRT or CT Registry Compass have ads?

Neither CT Exam Prep for ARRT nor CT Registry Compass shows ads.

### Which is updated more often, CT Exam Prep for ARRT or CT Registry Compass?

CT Exam Prep for ARRT ships an update every 3 months, and CT Registry Compass every 5 days. Most recently, CT Exam Prep for ARRT was updated on October 28, 2026 and CT Registry Compass on November 5, 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.*