Apps like Otamatone

Here are some great alternatives to Otamatone by Rodion Terekhin :
SpectrumGen
SpectrumGen
★5.0
Synth Super JX
Synth Super JX
★4.2
Noteworthy Tuner
Noteworthy Tuner
★4.6
OPNMIDI Player
OPNMIDI Player
★4.2
ADLMIDI Player
ADLMIDI Player
★4.4
Steel Tongue Drum
Steel Tongue Drum
★4.1
CarlTune - Chromatic Tuner
CarlTune - Chromatic Tuner
★4.7
Mini Tunes - Microtonal Synth
Mini Tunes - Microtonal Synth
★3.7
Stylusphone 3D
Stylusphone 3D
★3.3
BOSS Tuner
BOSS Tuner
★4.3
A-Tuner Lite
A-Tuner Lite
★4.3
Chromatic Tuner
Chromatic Tuner
★3.7
Trumpet Fingering Chart
Trumpet Fingering Chart
★4.7
Tuner Lite - Instrument Tuner
Tuner Lite - Instrument Tuner
★3.3
Droid Synth
Droid Synth
★4.4
Rockrelay Synth FM
Rockrelay Synth FM
★4.1