Apps like HarpNinja

Here are some great alternatives to HarpNinja by Sonicviz :
Harmonica Bending Trainer
Harmonica Bending Trainer
★4.6
Harmonica tuner
Harmonica tuner
★4.1
Harmonica Lessons
Harmonica Lessons
★3.8
Harmonica Easy Tab
Harmonica Easy Tab
★4.0
Chromatic Harmonica
Chromatic Harmonica
★3.7
Harmonica Sounds
Harmonica Sounds
★4.2
Harmonica Exercises
Harmonica Exercises
★4.7
BluesHarpHelper
BluesHarpHelper
★3.6
Harp-A-Matic 2.0 - Learn & Mas
Harp-A-Matic 2.0 - Learn & Mas
★3.8
Hohner-ADG Button Accordion
Hohner-ADG Button Accordion
★4.0
MuseScore: sheet music
MuseScore: sheet music
★3.8
Hohner-BbEbAb Button Accordion
Hohner-BbEbAb Button Accordion
★4.9
Accordion Diatonic Cassoto
Accordion Diatonic Cassoto
★4.4
Mezquite Diatonic Accordion
Mezquite Diatonic Accordion
★4.5
Mezquite Chromatic Accordion
Mezquite Chromatic Accordion
★4.0
Taiko Sounds - instrument app
Taiko Sounds - instrument app
★3.7