# Number Decomposition vs Zerlegen

The clearest difference is update cadence: Zerlegen at every 5 weeks against Number Decomposition's every 5 months. Zerlegen also leads on price ($0.49 vs $3.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Number Decomposition costs $3.99 and Zerlegen $0.49 up front. Neither carries in-app purchases, so what you see is what you pay.

Number Decomposition ships an update every 5 months, Zerlegen every 5 weeks. The most recent releases landed on October 12, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Number Decomposition | Zerlegen |
| --- | --- | --- |
| Price | $3.99 | **$0.49** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 5 weeks** |
| Monetization | Paid | — |
| Size | 78 MB | 52 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lernwunder](https://appshunter.io/developer/1840747082) | [Christian Urff](https://appshunter.io/developer/415894463) |

## What reviewers say

### Number Decomposition

[App page](https://appshunter.io/ios/app/number-decomposition-math/id6752735119)

This educational app teaches children foundational math skills by focusing on number bonds up to 10, avoiding counting to build a strong understanding of arithmetic. It uses visual aids and a structured approach for quick, accurate recall of addition and subtraction facts.

**Highlights:** Number bonds up to 10, Drag and drop interface, Visual quantity images, Spaced repetition learning, Child-friendly avatars, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


### Zerlegen

[App page](https://appshunter.io/ios/app/zerlegen/id6793009177)

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

**In-app purchases:** none


## Frequently asked questions

### Is Number Decomposition free?

Number Decomposition costs $3.99, with no in-app purchases.

### Is Zerlegen free?

Zerlegen costs $0.49, with no in-app purchases.

### Do Number Decomposition or Zerlegen have ads?

Neither Number Decomposition nor Zerlegen shows ads.

### Which is updated more often, Number Decomposition or Zerlegen?

Number Decomposition ships an update every 5 months, and Zerlegen every 5 weeks. Most recently, Number Decomposition was updated on October 12, 2026 and Zerlegen on October 14, 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.*