Hanauta Chord Sheet is a simple and intuitive chord chart app designed for guitar practice and songwriting. You can quickly enter diatonic chords using numbers (1–7) and switch between chord number display and chord name display at any time. Sections (Sec.) can be added, deleted, or rearranged easily, allowing you to manage song structures flexibly. Notes and song ideas can also be written freely in the memo area. PDF export and cloud saving are available with the Pro version.