e-ONIGIRI英単語 is an educational app designed to make learning English vocabulary enjoyable and effective. Developed by IIZUNA SHOTEN CO.LTD., this free app offers a range of features to enhance the learning experience. With approximately 10,000 carefully selected words supervised by Professor Shigenori Tanaka from Keio University, users can accumulate points, unlock cute onigiri characters, and access placement tests for continuous evaluation.

Suitable for students from junior high to adults, the app allows users to tailor their learning to their vocabulary level. It offers various training methods based on memory retention theories, multiple question formats, pronunciation guides, and a dictionary feature for deeper understanding. Learning progress is tracked through word lists and flashcards.