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Airfoil vs SoundSource: catalog facts
Airfoil	SoundSource
Paid Paid app from Rogue Amoeba, with a free download to try before purchase.	Paid Paid app with a free download to try it before purchase.
macOS	macOS
Sends audio from any Mac app, not only apps with built-in casting Plays to several speakers of different types in sync	Per-app volume and output device routing Audio effects and Audio Unit support for any app
The sending app runs on macOS only Paid software	macOS only Paid after the trial
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.