MorphVOX is a real-time voice changing program that’s available in a free or paid version. So, below is a complete list of the best voice changing apps for Mac in 2021. In short, it can change the tone or pitch of your voice to sound like a monster, child, male, female, and so on. So, what is a voice changer? Well, a voice changer for Mac or Windows is software for modulating voices using special effects.