
Porthole
CommercialPorthole is a macOS application that elegantly solves the limitation of sending audio from your Mac to multiple AirPlay speakers simultaneously, a feature not natively supported. It acts as a virtual audio output device, allowing you to route any audio played on your Mac, whether it's from iTunes, Spotify, web browsers, or any other application, to multiple AirPlay-compatible devices like Apple TVs, AirPort Express, and other AirPlay speakers, all in perfect sync.