# 四字熟語判定 vs 四字熟語の暗記・反復学習｜エビ四

The clearest difference is in-app purchases: 四字熟語判定 at none against 四字熟語の暗記・反復学習｜エビ四's 1. 四字熟語判定 also leads on ads (none vs shown) and iOS requirement (9.0 vs 15.6). 四字熟語の暗記・反復学習｜エビ四's advantage is review sentiment (100% vs 67%) and update cadence (every 2 months vs every 4 months). On price 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. 四字熟語判定 asks for nothing beyond the download.

四字熟語判定 ships an update every 4 months, 四字熟語の暗記・反復学習｜エビ四 every 2 months. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | 四字熟語判定 | 四字熟語の暗記・反復学習｜エビ四 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | — | Ad-supported |
| Size | 43 MB | 13 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Gloding Inc.](https://appshunter.io/developer/780228385) | [keiji imamura](https://appshunter.io/developer/1496803101) |

## What reviewers say

### 四字熟語判定

[App page](https://appshunter.io/ios/app/id888619156)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is 四字熟語判定 free?

四字熟語判定 is free to download, with no in-app purchases.

### 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.

### Do 四字熟語判定 or 四字熟語の暗記・反復学習｜エビ四 have ads?

四字熟語の暗記・反復学習｜エビ四 shows ads; 四字熟語判定 does not.

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

四字熟語判定 ships an update every 4 months, and 四字熟語の暗記・反復学習｜エビ四 every 2 months. Most recently, 四字熟語判定 was updated on November 1, 2026 and 四字熟語の暗記・反復学習｜エビ四 on November 7, 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.*