Any app which uses the microphone or any other audio capture device will get affected with this app.
Clownfish Voice Changer app is installed on the system level. In short, your voice will be modified in Skype, Viber, Hangouts, TeamSpeak, Jitsi, Ekiga, Mumble, Steam, ooVoo, Ventrilo, Discord, etc. Introduction: Clownfish Voice Changer for Mac, Skype, Discord, Teamspeak with how to use and fix guide is here.