# MBookTester vs Korean Checker

The clearest difference is in-app purchases: MBookTester at none against Korean Checker's 4. MBookTester also leads on ads (none vs shown) and rating (5.0 vs 4.7). Korean Checker's advantage is ratings volume (55 vs 1). On price, review sentiment and update cadence there is nothing between them.

Both are free to download. Korean Checker sells 2 in-app purchases, starting at $3.99 per month. MBookTester asks for nothing beyond the download.

MBookTester holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Korean Checker has 55 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 50% of MBookTester's written reviews are positive against 53% of Korean Checker's, so the app with the better star average is not the one people write more warmly about.

MBookTester ships an update every 4 months, Korean Checker every 5 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | MBookTester | Korean Checker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mbooktester/id435875412/reviews)** | [4.7 (55 ratings)](https://appshunter.io/ios/app/korean-checker/id1476172458/reviews) |
| Number of ratings | 1 | **55** |
| Positive reviews | 50.0% of reviews | **52.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 5 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 16 MB | 35 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [soluwin corporation](https://appshunter.io/developer/747540016) | [Hyunwoo Kim](https://appshunter.io/developer/1709269004) |

## What reviewers say

### MBookTester

[App page](https://appshunter.io/ios/app/mbooktester/id435875412)

This app allows InDesign users to preview and test multimedia content created with mbook 2.0 on their iPad. It provides a realistic testing experience before distributing content online.

**Highlights:** Preview mbook 2.0 digital publications, Test multimedia content, Realistic iPad feel, Copy .mbook files via iTunes, Better than iPad simulator testing

**Features:** macOS Compatibility

**In-app purchases:** none


### Korean Checker

[App page](https://appshunter.io/ios/app/korean-checker/id1476172458)

Correct spelling and spacing errors in Korean sentences. This app offers AI-powered sentence transformation, a history of corrections, and easy sharing of the results. It helps users identify and learn from common mistakes.

**Highlights:** Correct spelling and spacing, AI sentence transformation, Copy corrected sentences, Share easily, Correction history, Check frequently misspelled words

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $3.99 | per month |
| Annual subscription | $19.99 | per year |


## Frequently asked questions

### Is MBookTester free?

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

### Is Korean Checker free?

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

### Which has better reviews, MBookTester or Korean Checker?

MBookTester is rated higher. MBookTester averages 5.0 out of 5 from 1 ratings, while Korean Checker averages 4.7 from 55 ratings.

### Do MBookTester or Korean Checker have ads?

Korean Checker shows ads; MBookTester does not.

### Which is updated more often, MBookTester or Korean Checker?

MBookTester ships an update every 4 months, and Korean Checker every 5 months. Most recently, MBookTester was updated on November 1, 2026 and Korean Checker on November 6, 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.*