# Data Engineer Cert Prep vs NCA

The clearest difference is in-app purchases: NCA 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. NCA asks for nothing beyond the download.

Data Engineer Cert Prep ships an update every 2 months, NCA every 3 months. The most recent releases landed on November 4, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Data Engineer Cert Prep | NCA |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Size | 1 MB | 26 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 |


### NCA

[App page](https://appshunter.io/ios/app/nca-aiio-ai-infrastructure/id6757193320)

**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 NCA free?

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

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

Neither Data Engineer Cert Prep nor NCA shows ads.

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

Data Engineer Cert Prep ships an update every 2 months, and NCA every 3 months. Most recently, Data Engineer Cert Prep was updated on November 4, 2026 and NCA on October 28, 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.*