# Number Decomposition vs Roll & Count

The clearest difference is price: Roll & Count at Free against Number Decomposition's $3.99. Roll & Count also leads on update cadence (every 2 months vs every 5 months) and iOS requirement (15.1 vs 17.0). Number Decomposition's advantage is in-app purchases (none vs 1). On ads and device support there is nothing between them.

Roll & Count is free to download; Number Decomposition costs $3.99 up front. Roll & Count sells 1 one-off in-app purchase. Number Decomposition asks for nothing beyond the download.

Number Decomposition ships an update every 5 months, Roll & Count every 2 months. The most recent releases landed on October 12, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Number Decomposition | Roll & Count |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 78 MB | 38 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lernwunder](https://appshunter.io/developer/1840747082) | [Harlan Barker](https://appshunter.io/developer/1892901464) |

## 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


### Roll & Count

[App page](https://appshunter.io/ios/app/roll-and-count/id6762099567)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Roll & Count Pro | $2.99 | one-time |


## Frequently asked questions

### Is Number Decomposition free?

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

### Is Roll & Count free?

Roll & Count is free to download, with in-app purchases available.

### Do Number Decomposition or Roll & Count have ads?

Neither Number Decomposition nor Roll & Count shows ads.

### Which is updated more often, Number Decomposition or Roll & Count?

Number Decomposition ships an update every 5 months, and Roll & Count every 2 months. Most recently, Number Decomposition was updated on October 12, 2026 and Roll & Count on October 6, 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.*