Airfoil
Airfoil sends audio from Mac apps and websites to wireless speakers and other devices. It can play to multiple outputs in sync, including a mix of AirPlay, Sonos, Chromecast, and Bluetooth devices.
Airfoil streams audio playing on your Mac to wireless speakers and other devices around your home. Sources can include music apps such as Spotify and audio playing in Safari or Chrome. Supported outputs include Apple TV, HomePod, third-party AirPlay hardware, Sonos devices, Chromecast devices, and Bluetooth speakers or headphones.
You can send audio to multiple outputs in sync, even when using different speaker types. Speaker groups let you select a whole-house setup or separate zones with one click. A built-in equalizer lets you adjust the sound, and compatible outputs can display track titles and album art.
The Airfoil Satellite companion app extends playback to other Macs, Windows PCs, iOS devices, and Android devices. Satellite on iOS, Mac, and Windows can also remotely control Airfoil and supported audio sources. Running Satellite on your Mac lets it receive audio from iOS; paired with Airfoil, it can forward that audio to multiple outputs.
Airfoil can start transmitting when you open it and automatically disconnect when the audio stream is silent. An optional menu bar mode keeps it accessible without a separate main window.