Musikui 穴埋め問題作成 is an educational program designed for iPhone users and developed by Hirotomo Kadoya. It offers a variety of features to enhance learning experiences. Users can create fill-in-the-blank questions by pasting desired text, select words to hide or reveal for study purposes, and even generate math problems with hidden answers. Additionally, the app allows users to practice vocabulary by creating English wordbooks, where words can be concealed with the option to reveal the initial letter.

With a focus on personalized learning, Musikui 穴埋め問題作成 enables users to toggle between displaying and hiding blanks with a single tap using the learning function. Furthermore, users can assess their learning progress by utilizing the testing feature post-memorization to strive for achieving perfect scores. The program also provides a feature for organizing questions into folders based on different subjects or categories, allowing for seamless management without limitations on the number of folders or questions.