旧版書籍用ターゲットの友1000　英熟語アプリ is a free educational app developed by Obunsha Co.Ltd. It is designed to support the learning of English idioms featured in the book "英熟語ターゲット1000　4訂版" by Obunsha. With over 2 million high school students utilizing the "ターゲットの友" app series for vocabulary learning, this eagerly awaited edition focuses on English idioms.

The app offers complete compatibility with the "英熟語ターゲット1000" book and features a listening function to aid in memorization. Users can test their proficiency in English idioms through the national ranking system provided by the app. Daily learning is made easy with the "Today's 5 Questions" feature, while avatar and calendar functions support continuous learning.

Please note that while the app is free to download, there are in-app purchases for certain features. For any questions, improvement suggestions, or inquiries regarding usage, users can contact the support team at