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

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