# Oral Arithmetic vs Simple Drawing：DuDu Games

The clearest difference is in-app purchases: Oral Arithmetic at none against Simple Drawing：DuDu Games's 2. Oral Arithmetic also leads on update cadence (every 7 months vs every 34 months) and iOS requirement (9.0 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. Simple Drawing：DuDu Games sells 2 in-app purchases, starting at $0.99 per month. Oral Arithmetic asks for nothing beyond the download.

Oral Arithmetic ships an update every 7 months, Simple Drawing：DuDu Games every 34 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Oral Arithmetic | Simple Drawing：DuDu Games |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 34 months |
| Size | 50 MB | 76 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [猛 王](https://appshunter.io/developer/1052102545) | [有量网络科技(天津)有限公司](https://appshunter.io/developer/1765488158) |

## What reviewers say

### Oral Arithmetic

[App page](https://appshunter.io/ios/app/oral-arithmetic/id1526252439)

**Features:** macOS Compatibility

**In-app purchases:** none


### Simple Drawing：DuDu Games

[App page](https://appshunter.io/ios/app/simple-drawingdudu-games/id6446129190)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $0.99 | per month |
| Annual subscription | $3.99 | per year |


## Frequently asked questions

### Is Oral Arithmetic free?

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

### Is Simple Drawing：DuDu Games free?

Simple Drawing：DuDu Games is free to download, with in-app purchases available.

### Do Oral Arithmetic or Simple Drawing：DuDu Games have ads?

Neither Oral Arithmetic nor Simple Drawing：DuDu Games shows ads.

### Which is updated more often, Oral Arithmetic or Simple Drawing：DuDu Games?

Oral Arithmetic ships an update every 7 months, and Simple Drawing：DuDu Games every 34 months. Most recently, Oral Arithmetic was updated on November 3, 2026 and Simple Drawing：DuDu Games on November 3, 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.*