# AST CST Exam Test vs CST Exam Prep

The clearest difference is ads: AST CST Exam Test at none against CST Exam Prep's shown. CST Exam Prep's advantage is update cadence (every 5 days vs every 4 weeks) and iOS requirement (15.1 vs 17.2). On price, in-app purchases and device support there is nothing between them.

Both are free to download. AST CST Exam Test sells 2 in-app purchases, starting at $9.99 per month and CST Exam Prep sells 5 in-app purchases, starting at $5.99 per 7 days. Whichever you choose, the download price is not the number that matters.

AST CST Exam Test ships an update every 4 weeks, CST Exam Prep every 5 days. The most recent releases landed on September 15, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | AST CST Exam Test | CST Exam Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 weeks | **Every 5 days** |
| Size | 9 MB | 47 MB |
| Requires iOS | 17.2 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Cargo Teleport Inc](https://appshunter.io/developer/1761832181) | [Ilia Chernikov](https://appshunter.io/developer/1818071113) |

## What reviewers say

### AST CST Exam Test

[App page](https://appshunter.io/ios/app/ast-cst-exam-test/id6736717763)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium monthly subscription | $9.99 | per month |
| Lifetime version | $19.99 | one-time |


### CST Exam Prep

[App page](https://appshunter.io/ios/app/cst-exam-prep/id6755035712)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $5.99 | per 7 days |
| Month | $9.99 | per month |
| 3 Month | $19.99 | per 3 months |
| 1 Month | $29.99 | per month |
| 3 Month | $59.99 | per 3 months |


## Frequently asked questions

### Is AST CST Exam Test free?

AST CST Exam Test is free to download, with in-app purchases available.

### Is CST Exam Prep free?

CST Exam Prep is free to download, with in-app purchases available.

### Do AST CST Exam Test or CST Exam Prep have ads?

CST Exam Prep shows ads; AST CST Exam Test does not.

### Which is updated more often, AST CST Exam Test or CST Exam Prep?

AST CST Exam Test ships an update every 4 weeks, and CST Exam Prep every 5 days. Most recently, AST CST Exam Test was updated on September 15, 2026 and CST Exam Prep on October 30, 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.*