# 4DNum vs YYM

The clearest difference is update cadence: YYM at every 2 weeks against 4DNum's every 6 weeks. 4DNum's advantage is iOS requirement (13.4 vs 15). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

4DNum ships an update every 6 weeks, YYM every 2 weeks. The most recent releases landed on October 7, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | 4DNum | YYM |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Size | 28 MB | 144 MB |
| Requires iOS | **13.4** | 15 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kian Kok Lai](https://appshunter.io/developer/1631952503) | [Ocean Labs Technologies](https://appshunter.io/developer/1810618168) |

## What reviewers say

### 4DNum

[App page](https://appshunter.io/ios/app/4dnum/id1631952501)

**Features:** macOS Compatibility

**In-app purchases:** none


### YYM

[App page](https://appshunter.io/ios/app/yym/id6771330980)

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

**In-app purchases:** none


## Frequently asked questions

### Is 4DNum free?

4DNum is free to download, with no in-app purchases.

### Is YYM free?

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

### Do 4DNum or YYM have ads?

Neither 4DNum nor YYM shows ads.

### Which is updated more often, 4DNum or YYM?

4DNum ships an update every 6 weeks, and YYM every 2 weeks. Most recently, 4DNum was updated on October 7, 2026 and YYM on October 5, 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.*