# Data Engineer Cert Prep vs BioFlash by EtemiDev

The clearest difference is price: Data Engineer Cert Prep at Free against BioFlash by EtemiDev's $1.99. Data Engineer Cert Prep also leads on device support. On in-app purchases and iOS requirement there is nothing between them.

Data Engineer Cert Prep is free to download; BioFlash by EtemiDev costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Data Engineer Cert Prep | BioFlash by EtemiDev |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 13 months | — |
| Size | 1 MB | 28 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | **iPhone, iPad, Mac** | — |
| Age rating | 4+ | 12+ |
| Developer | [DjamgaTech Corp](https://appshunter.io/developer/969000181) | [Gentiana Etemi](https://appshunter.io/developer/1883027493) |

## What reviewers say

### Data Engineer Cert Prep

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

**Features:** Vision Pro support

**In-app purchases:** none


### BioFlash by EtemiDev

[App page](https://appshunter.io/ios/app/bioflash-by-etemidev/id6760253478)

**In-app purchases:** none


## Frequently asked questions

### Is Data Engineer Cert Prep free?

Data Engineer Cert Prep is free to download, with no in-app purchases.

### Is BioFlash by EtemiDev free?

BioFlash by EtemiDev costs $1.99, with no in-app purchases.

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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.*