Benkyō is an iOS application that provides comprehensive Japanese language study tools, featuring an extensive database of over 2,000 kanji and 10,000 vocabulary entries with customizable sorting options. The app implements an adaptive spaced repetition system that optimizes review scheduling and automatically adjusts to user study patterns. Learning modes include multiple-choice quizzes, keyboard input, and handwriting recognition, complemented by features such as stroke order practice and pronunciation audio. The platform offers detailed progress tracking through visual statistics and supports flexible study methods through customizable lists and filtered content selection.