# Data Engineer Cert Prep vs AZ

The clearest difference is in-app purchases: AZ at none against Data Engineer Cert Prep's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Data Engineer Cert Prep sells 1 one-off in-app purchase. AZ asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on November 12, 2026.

## The numbers

| Metric | Data Engineer Cert Prep | AZ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 1 MB | 30 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DjamgaTech Corp](https://appshunter.io/developer/969000181) | [Davy Raitt](https://appshunter.io/developer/1795318281) |

## 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 |


### AZ

[App page](https://appshunter.io/ios/app/az-800-windows-server-hybrid/id6751620676)

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

**In-app purchases:** none


## Frequently asked questions

### Is Data Engineer Cert Prep free?

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

### Is AZ free?

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

### Do Data Engineer Cert Prep or AZ have ads?

Neither Data Engineer Cert Prep nor AZ shows ads.

### Which is updated more often, Data Engineer Cert Prep or AZ?

Data Engineer Cert Prep ships an update every 2 months, and AZ every 2 months. Most recently, Data Engineer Cert Prep was updated on November 12, 2026 and AZ on November 12, 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.*