# Data Engineer Cert Prep vs BioFlash

The clearest difference is update cadence: Data Engineer Cert Prep at every 2 months against BioFlash's every 7 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Data Engineer Cert Prep sells 1 one-off in-app purchase and BioFlash sells 1 in-app purchase, starting at $2.99 per year. Whichever you choose, the download price is not the number that matters.

Data Engineer Cert Prep ships an update every 2 months, BioFlash every 7 months. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Data Engineer Cert Prep | BioFlash |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Size | 1 MB | 44 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| 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, iPhone Duo support

**In-app purchases (1)**

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


### BioFlash

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

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BioFlash Premium | $2.99 | per year |


## Frequently asked questions

### Is Data Engineer Cert Prep free?

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

### Is BioFlash free?

BioFlash is free to download, with in-app purchases available.

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

Neither Data Engineer Cert Prep nor BioFlash shows ads.

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

Data Engineer Cert Prep ships an update every 2 months, and BioFlash every 7 months. Most recently, Data Engineer Cert Prep was updated on November 4, 2026 and BioFlash on November 5, 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.*