# 4D Гэр vs Topik One

The clearest difference is in-app purchases: 4D Гэр at none against Topik One's 13. 4D Гэр also leads on ads (none vs shown) and iOS requirement (8.0 vs 18.0). Topik One's advantage is update cadence (every 3 days vs every 2 months). On price and device support there is nothing between them.

Both are free to download. Topik One sells 13 in-app purchases, starting at $2.99 per month. 4D Гэр asks for nothing beyond the download.

4D Гэр ships an update every 2 months, Topik One every 3 days. The most recent releases landed on October 12, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | 4D Гэр | Topik One |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 3 days** |
| Size | 228 MB | 43 MB |
| Requires iOS | **8.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Batzorig Nyamdeleg](https://appshunter.io/developer/1048907258) | [jaemin park](https://appshunter.io/developer/1663603862) |

## What reviewers say

### 4D Гэр

[App page](https://appshunter.io/ios/app/4d/id1114403841)

**Features:** macOS Compatibility

**In-app purchases:** none


### Topik One

[App page](https://appshunter.io/ios/app/topik-one-korean-test-prep/id6738022245)

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

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1-month subscription | $2.99 | per month |
| 1-year subscription | $19.99 | per year |
| Reading 5th Exam | $0.99 | one-time |
| Reading 6th Exam | $0.99 | one-time |
| Reading 7th Exam | $0.99 | one-time |
| Reading 8th Exam | $0.99 | one-time |
| Listening 2nd Exam | $1.99 | one-time |
| Listening 3rd Exam | $1.99 | one-time |
| Listening 4th Exam | $1.99 | one-time |
| Listening 5th Exam | $1.99 | one-time |
| Listening 6th Exam | $1.99 | one-time |
| Listening 7th Exam | $1.99 | one-time |
| Remove Advertisement | $1.99 | one-time |


## Frequently asked questions

### Is 4D Гэр free?

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

### Is Topik One free?

Topik One is free to download, with in-app purchases available.

### Do 4D Гэр or Topik One have ads?

Topik One shows ads; 4D Гэр does not.

### Which is updated more often, 4D Гэр or Topik One?

4D Гэр ships an update every 2 months, and Topik One every 3 days. Most recently, 4D Гэр was updated on October 12, 2026 and Topik One on October 20, 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.*