# Data Engineer Cert Prep vs AWS Knowledge Test

The clearest difference is device support: Data Engineer Cert Prep at 3 against AWS Knowledge Test's 1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Data Engineer Cert Prep sells 1 one-off in-app purchase and AWS Knowledge Test sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Data Engineer Cert Prep ships an update every 2 months, AWS Knowledge Test every 5 weeks. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Data Engineer Cert Prep | AWS Knowledge Test |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Size | 1 MB | 13 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [DjamgaTech Corp](https://appshunter.io/developer/969000181) | [Cargo Teleport Inc](https://appshunter.io/developer/1761832181) |

## What reviewers say

### Data Engineer Cert Prep

[App page](https://appshunter.io/ios/app/data-engineer-cert-prep/id6566170013)

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 50 More Questions | $4.99 | one-time |


### AWS Knowledge Test

[App page](https://appshunter.io/ios/app/aws-knowledge-test/id6680152225)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium monthly subscription | $9.99 | per month |
| Lifetime version | $24.99 | one-time |


## Frequently asked questions

### Is Data Engineer Cert Prep free?

Data Engineer Cert Prep is free to download, with in-app purchases available.

### Is AWS Knowledge Test free?

AWS Knowledge Test is free to download, with in-app purchases available.

### Do Data Engineer Cert Prep or AWS Knowledge Test have ads?

Neither Data Engineer Cert Prep nor AWS Knowledge Test shows ads.

### Which is updated more often, Data Engineer Cert Prep or AWS Knowledge Test?

Data Engineer Cert Prep ships an update every 2 months, and AWS Knowledge Test every 5 weeks. Most recently, Data Engineer Cert Prep was updated on November 4, 2026 and AWS Knowledge Test 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.*