GEN strings｜弦楽器の練習アプリ（チェロ・バイオリン・ビオラ）

This is a web app where you can use your smartphone screen as a fretboard to practice while checking finger positions, finger numbers, and pitch. It features song practice (MusicXML / MIDI file loading), scale practice, a metronome, a tuner, and a practice calendar. When you log in, your settings, fingerings, favorites, and practice records can be transferred to other devices. No installation is required—it runs entirely in your browser.