英検でる単 is a free educational app developed by 学習アプリ化プロジェクト. It is a convenient tool for studying and reviewing English words and phrases that have appeared in the past 20 years of the Eiken (English proficiency test) exams. The app allows users to test their knowledge through quizzes and provides meanings of the words in a quiz format. Users can also choose to solve problems based on the difficulty level or focus on specific topics by selecting checked questions. The app includes example sentences and mnemonic devices to aid in memorization, making it an ideal resource for those who struggle to remember vocabulary. With its user-friendly interface and effective study features, 英検でる単 is a recommended companion for Eiken test preparation.