MXTPiano: Play with MusicXML app for iPhone and iPad
MXTPiano is a free app to help you practice Piano.
With a MIDI piano, You can play along with a MusicXML file and the notes you played will be compared with the correct notes and wrong notes are shown as you play
please see the following link for a demo video:
https://youtube.com/shorts/LKcqo6RvZLs
and the following for documentation:
https://piano.mxtsoft.com/doc