# 四字熟語の暗記・反復学習｜エビ四 vs 慣用句 !

The clearest difference is in-app purchases: 慣用句 ! at none against 四字熟語の暗記・反復学習｜エビ四's 1. 慣用句 ! also leads on iOS requirement (13.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 四字熟語の暗記・反復学習｜エビ四 sells 1 one-off in-app purchase. 慣用句 ! asks for nothing beyond the download.

四字熟語の暗記・反復学習｜エビ四 ships an update every 2 months, 慣用句 ! every 3 months. Both last shipped on October 8, 2026.

## The numbers

| Metric | 四字熟語の暗記・反復学習｜エビ四 | 慣用句 ! |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Ad-supported | — |
| Size | 13 MB | 154 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [keiji imamura](https://appshunter.io/developer/1496803101) | [Ohmori Takeru](https://appshunter.io/developer/969791681) |

## What reviewers say

### 四字熟語の暗記・反復学習｜エビ四

[App page](https://appshunter.io/ios/app/id1504085749)

Learn 1600 Japanese four-character idioms through engaging quizzes and a spaced repetition system. This app helps improve vocabulary and prepare for exams and general knowledge tests, incorporating proverbs and idiomatic expressions.

**Highlights:** 1600 four-character idioms included, Spaced repetition algorithm, Game-like learning, Simple and intuitive interface, Randomized quiz questions, Progress tracking for mastery

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告非表示 | $2.99 | one-time |


### 慣用句 !

[App page](https://appshunter.io/ios/app/id6470895936)

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

**In-app purchases:** none


## Frequently asked questions

### Is 四字熟語の暗記・反復学習｜エビ四 free?

四字熟語の暗記・反復学習｜エビ四 is free to download, with in-app purchases available.

### Is 慣用句 ! free?

慣用句 ! is free to download, with no in-app purchases.

### Do 四字熟語の暗記・反復学習｜エビ四 or 慣用句 ! have ads?

Both 四字熟語の暗記・反復学習｜エビ四 and 慣用句 ! show ads.

### Which is updated more often, 四字熟語の暗記・反復学習｜エビ四 or 慣用句 !?

四字熟語の暗記・反復学習｜エビ四 ships an update every 2 months, and 慣用句 ! every 3 months. Most recently, 四字熟語の暗記・反復学習｜エビ四 was updated on October 8, 2026 and 慣用句 ! on October 8, 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.*