Mini Piano Lite for Android - Download the APK from Uptodown
Androidアプリ】 Umitoさん作の鍵盤アプリ「Mini Piano Lite」も、他アプリでの強制縦化でいい感じの縦鍵盤アプリになります : 林檎の国、泥の国
Tiny Piano - Free Songs to Play and Learn! on the App Store
PlayShifu Plugo Tunes - Piano Learning Kit. Musical STEM Toy for Ages 4-10. Music Instrument Gift for Boys & Girls Works with iOS, Android & Fire | Very Ireland