# Onilo vs Das Zahlenbuch

The clearest difference is in-app purchases: Onilo at none against Das Zahlenbuch's 4. Onilo also leads on update cadence (every 3 months vs every 7 months). Das Zahlenbuch's advantage is iOS requirement (12.0 vs 15.1). 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. Onilo asks for nothing beyond the download.

Onilo ships an update every 3 months, Das Zahlenbuch every 7 months. The most recent releases landed on September 13, 2026 and August 23, 2026 respectively.

## The numbers

| Metric | Onilo | Das Zahlenbuch |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 25.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 7 months |
| Monetization | — | Free with in-app purchases |
| Size | 22 MB | 65 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [StoryDOCKS GmbH](https://appshunter.io/developer/1523051642) | [Ernst Klett Verlag GmbH, Stuttgart](https://appshunter.io/developer/751540887) |

## What reviewers say

### Onilo

[App page](https://appshunter.io/ios/app/onilo/id1523051643)

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Onilo free?

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

### Is Das Zahlenbuch free?

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

### Do Onilo or Das Zahlenbuch have ads?

Neither Onilo nor Das Zahlenbuch shows ads.

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

Onilo ships an update every 3 months, and Das Zahlenbuch every 7 months. Most recently, Onilo was updated on September 13, 2026 and Das Zahlenbuch on August 23, 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.*