# Das Zahlenbuch vs KDE

The clearest difference is in-app purchases: KDE at none against Das Zahlenbuch's 4. KDE also leads on update cadence (every 10 days vs every 7 months). Das Zahlenbuch's advantage is iOS requirement (12.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. Das Zahlenbuch sells 4 one-off in-app purchases. KDE asks for nothing beyond the download.

Das Zahlenbuch ships an update every 7 months, KDE every 10 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Das Zahlenbuch | KDE |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 10 days** |
| Monetization | Free with in-app purchases | — |
| Size | 65 MB | 91 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ernst Klett Verlag GmbH, Stuttgart](https://appshunter.io/developer/751540887) | [Zaubar](https://appshunter.io/developer/1462173514) |

## What reviewers say

### Das Zahlenbuch

[App page](https://appshunter.io/ios/app/das-zahlenbuch/id1581958376)

This app offers interactive math exercises for grades 1-4, covering core curriculum topics. It provides immediate feedback and progress tracking, allowing for personalized learning at home or in the classroom. The app is designed for independent use and offline access.

**Highlights:** Interactive math exercises for grades 1-4, Covers 6 central topics per school year, Visual support tools, Immediate feedback on solutions, Progress tracking for assessment, Offline usability

**Features:** Family Sharing

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Das Zahlenbuch Klasse 1 | $2.99 | one-time |
| Das Zahlenbuch Klasse 2 | $2.99 | one-time |
| Das Zahlenbuch Klasse 3 | $2.99 | one-time |
| Das Zahlenbuch Klasse 4 | $2.99 | one-time |


### KDE

[App page](https://appshunter.io/ios/app/kde/id6761364848)

**In-app purchases:** none


## Frequently asked questions

### Is Das Zahlenbuch free?

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

### Is KDE free?

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

### Do Das Zahlenbuch or KDE have ads?

Neither Das Zahlenbuch nor KDE shows ads.

### Which is updated more often, Das Zahlenbuch or KDE?

Das Zahlenbuch ships an update every 7 months, and KDE every 10 days. Most recently, Das Zahlenbuch was updated on November 3, 2026 and KDE on October 31, 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.*