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Airfoil vs Audio Sharing: catalog facts
Airfoil	Audio Sharing
Paid Paid app from Rogue Amoeba, with a free download to try before purchase.	Free Free and open source under the GPL-3.0-or-later licence.
macOS	Linux
Sends audio from any Mac app, not only apps with built-in casting Plays to several speakers of different types in sync	Streams system audio with one click QR code makes connecting a phone quick
The sending app runs on macOS only Paid software	Linux only Infrequent releases; last version dates from 2024
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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