手軽
手軽で勉強になる
このアプリいいよー
集中した！
選ぶことが楽しい！
選ぶことが楽しい！
脳トレになる
使ったことのない四字熟語も出てくるので勉強になります！すきま時間にちょこちょこできるのでとてもいいです。
学べる
知らない四字熟語を学べて良い。とても勉強になる。
勉強になる
いろんな四字熟語が覚えられそう。
Free
In-App PurchasesWith Ads
About
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.
✓1600 four-character idioms included
✓Spaced repetition algorithm
✓Game-like learning
✓Simple and intuitive interface
✓Randomized quiz questions
✓Progress tracking for mastery
Show original description
What's New in 四字熟語スピード暗記(エビ四)～繰り返して覚える熟語学習～
1.4.3
November 17, 2025
・パフォーマンスの改善を行いました。
1
In-App Purchases
$2.99
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FAQ
What is the learning method used by エビ四?
エビ四 utilizes a spaced repetition algorithm based on the forgetting curve. This means it intelligently schedules reviews of idioms before you forget them, optimizing memory retention and learning efficiency.
How many idioms are available in エビ四?
The app includes a comprehensive collection of 1600 four-character idioms, ranging from basic ones used in daily life to more advanced expressions suitable for general knowledge.
Does エビ四 have ads?
Yes, this app displays advertisements as it is ad-supported. These ads are delivered through an ad network.
Is エビ四 suitable for exam preparation?
Yes, エビ四 is ideal for preparing for Japanese language exams, school tests, and general knowledge quizzes for job applications. It helps build vocabulary and comprehension.
How does エビ四 track user progress?
The app tracks progress by re-presenting idioms that were answered incorrectly. Once an idiom is answered correctly four times in a row, it is moved to a 'hall of fame' and no longer appears, allowing users to focus on challenging material.
What devices can I use エビ四 on?
エビ四 is available for iPhone, iPad, and iPod devices, making it accessible for a wide range of Apple users.
How often is エビ四 updated?
The app was last updated on November 17, 2025, indicating ongoing development and support. The latest version is 1.4.3.
What is the age rating for エビ四?
エビ四 has an age rating of 4+, making it suitable for young learners and users of all ages interested in Japanese idioms.
