# TheoriePLUS vs ZKN

The clearest difference is device support: TheoriePLUS at 2 against ZKN's —. On price, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | TheoriePLUS | ZKN |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 4 months | — |
| Size | 240 MB | 3 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | **iPhone, iPad** | — |
| Age rating | 4+ | 4+ |
| Developer | [Fahrschul Media GmbH](https://appshunter.io/developer/1638578344) | [Simity GmbH](https://appshunter.io/developer/1527290080) |

## What reviewers say

### TheoriePLUS

[App page](https://appshunter.io/ios/app/theorieplus/id1638578342)

**In-app purchases:** none


### ZKN

[App page](https://appshunter.io/ios/app/zkn-azubi/id1639606909)

**In-app purchases:** none


## Frequently asked questions

### Is TheoriePLUS free?

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

### Is ZKN free?

ZKN is free to download, 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.*