# クレイジー英語クイズ vs Iknow?

The clearest difference is in-app purchases: クレイジー英語クイズ at none against Iknow?'s 4. クレイジー英語クイズ also leads on update cadence (every 4 months vs every 19 months). Iknow?'s advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Iknow? sells 4 one-off in-app purchases. クレイジー英語クイズ asks for nothing beyond the download.

クレイジー英語クイズ ships an update every 4 months, Iknow? every 19 months. The most recent releases landed on October 16, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | クレイジー英語クイズ | Iknow? |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (9 ratings)](https://appshunter.io/ios/app/id1219784907/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 72.4% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 months** | Every 19 months |
| Size | 149 MB | 45 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [HENN Inc.](https://appshunter.io/developer/734265844) | [Juan Ormaechea](https://appshunter.io/developer/1662392975) |

## What reviewers say

### クレイジー英語クイズ

[App page](https://appshunter.io/ios/app/id1219784907)

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

**In-app purchases:** none


### Iknow?

[App page](https://appshunter.io/ios/app/iknow/id1663544387)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10 coins | $0.99 | one-time |
| 25 coins | $1.99 | one-time |
| 60 Coins | $2.99 | one-time |
| Premiun Plan | $3.99 | one-time |


## Frequently asked questions

### Is クレイジー英語クイズ free?

クレイジー英語クイズ is free to download, with no in-app purchases.

### Is Iknow? free?

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

### Do クレイジー英語クイズ or Iknow? have ads?

クレイジー英語クイズ shows ads; Iknow? does not.

### Which is updated more often, クレイジー英語クイズ or Iknow??

クレイジー英語クイズ ships an update every 4 months, and Iknow? every 19 months. Most recently, クレイジー英語クイズ was updated on October 16, 2026 and Iknow? on October 1, 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.*