# RAYUL 한글숲 vs Number Master

The clearest difference is ads: RAYUL 한글숲 at none against Number Master's shown. Number Master's advantage is iOS requirement (15.0 vs 17.0). On price, update cadence, 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.

RAYUL 한글숲 ships an update weekly, Number Master every 5 days. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | RAYUL 한글숲 | Number Master |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Weekly | **Every 5 days** |
| Size | 41 MB | 161 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [YOUNGSOO KIM](https://appshunter.io/developer/1895715033) | [ENDEVLAB](https://appshunter.io/developer/1803275438) |

## What reviewers say

### RAYUL 한글숲

[App page](https://appshunter.io/ios/app/rayul/id6783611502)

**Features:** macOS Compatibility

**In-app purchases:** none


### Number Master

[App page](https://appshunter.io/ios/app/number-master-brain-boost/id6809281335)

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

**In-app purchases:** none


## Frequently asked questions

### Is RAYUL 한글숲 free?

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

### Is Number Master free?

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

### Do RAYUL 한글숲 or Number Master have ads?

Number Master shows ads; RAYUL 한글숲 does not.

### Which is updated more often, RAYUL 한글숲 or Number Master?

RAYUL 한글숲 ships an update weekly, and Number Master every 5 days. Most recently, RAYUL 한글숲 was updated on October 14, 2026 and Number Master on October 11, 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.*