音符を読む練習アプリ:おんぷまなび is a music & audio app by TaK.dev with 50,000+ downloads (about 65K estimated). +253 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “It is an application for training reading of sheet music such as piano.
You can train the treble clef (2 octaves) and the bass clef (2 octaves).
◯ Safety and security
No ads are displayed.
Your child will not accidentally press an ad and go to a strange site.
It is designed to help you concentrate on reading music.…”