Harmonizr is a vocal harmonizer offering a unique and fun user interface.
Size - 9.2mb
IOS - 10.2+
Format - AU/Standalone
Post any issues you have found.
I can't seem to get this working in BM3 as an Audio+MIDI AUFX. The Audio works, but it does not receive MIDI currently (BM3 v3.0.12). Love Harmonizr though (it works well with Audiobus 3).