WabunMaster is a practice app specialized in learning "Japanese Morse code," known as Wabun. While Morse code, especially in Japanese, is less commonly used today, it still finds application in fields like amateur radio. Unlike typical multiple-choice input methods, WabunMaster features a unique flick input style to facilitate learning without the possibility of guessing answers.

Users can customize the scope of questions, the number of questions, and the intervals between them, allowing for tailored practice sessions based on proficiency levels. The app's sound and speed settings are calibrated to the standards of national communication exams, set at 800Hz and 25WPM. Though initially challenging, practicing at this pace can prove beneficial for real-world communication scenarios and official exams.