# 四字熟語の暗記・反復学習｜エビ四 vs 土壌医検定1級対策 300問

The clearest difference is price: 四字熟語の暗記・反復学習｜エビ四 at Free against 土壌医検定1級対策 300問's $3.99. 土壌医検定1級対策 300問's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

四字熟語の暗記・反復学習｜エビ四 is free to download; 土壌医検定1級対策 300問 costs $3.99 up front. 四字熟語の暗記・反復学習｜エビ四 sells 1 one-off in-app purchase. 土壌医検定1級対策 300問 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, 土壌医検定1級対策 300問 every 2 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 四字熟語の暗記・反復学習｜エビ四 | 土壌医検定1級対策 300問 |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Ad-supported | — |
| Size | 13 MB | 34 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [keiji imamura](https://appshunter.io/developer/1496803101) | [satoshi yoshida](https://appshunter.io/developer/1873856165) |

## 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 |


### 土壌医検定1級対策 300問

[App page](https://appshunter.io/ios/app/1-300/id6790292998)

**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 土壌医検定1級対策 300問 free?

土壌医検定1級対策 300問 costs $3.99, with no in-app purchases.

### Do 四字熟語の暗記・反復学習｜エビ四 or 土壌医検定1級対策 300問 have ads?

四字熟語の暗記・反復学習｜エビ四 shows ads; 土壌医検定1級対策 300問 does not.

### Which is updated more often, 四字熟語の暗記・反復学習｜エビ四 or 土壌医検定1級対策 300問?

四字熟語の暗記・反復学習｜エビ四 ships an update every 2 months, and 土壌医検定1級対策 300問 every 2 weeks. Most recently, 四字熟語の暗記・反復学習｜エビ四 was updated on October 24, 2026 and 土壌医検定1級対策 300問 on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*