# 丸単 vs Skix Echo

The clearest difference is in-app purchases: Skix Echo at none against 丸単's 10. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 丸単 sells 10 one-off in-app purchases. Skix Echo asks for nothing beyond the download.

丸単 ships an update every 4 days, Skix Echo every 5 days. The most recent releases landed on September 15, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | 丸単 | Skix Echo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 5 days |
| Size | 7 MB | 22 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [sungjae park](https://appshunter.io/developer/1896477219) | [SKIX K.K.](https://appshunter.io/developer/6787700517) |

## What reviewers say

### 丸単

[App page](https://appshunter.io/ios/app/id6767459920)

**Features:** Family Sharing

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TOPIK Upgrade 3 | $0.49 | one-time |
| TOPIK Upgrade 4 | $0.49 | one-time |
| All Upgrade Mixed | $0.49 | one-time |
| All Upgrade 4 TOPIK | $0.99 | one-time |
| TOPIK Upgrade 2 | $1.99 | one-time |
| All Upgrade 3 TOPIK | $1.99 | one-time |
| All Upgrade TOPIK | $1.99 | one-time |
| All Upgrade HANKEN | $1.99 | one-time |
| All Upgrade 2 TOPIK | $3.99 | one-time |
| All Upgrade 1 TOPIK | $4.99 | one-time |


### Skix Echo

[App page](https://appshunter.io/ios/app/skix-echo/id6803100267)

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

**In-app purchases:** none


## Frequently asked questions

### Is 丸単 free?

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

### Is Skix Echo free?

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

### Do 丸単 or Skix Echo have ads?

Neither 丸単 nor Skix Echo shows ads.

### Which is updated more often, 丸単 or Skix Echo?

丸単 ships an update every 4 days, and Skix Echo every 5 days. Most recently, 丸単 was updated on September 15, 2026 and Skix Echo on September 10, 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.*