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Airfoil vs Stream What You Hear: catalog facts
Airfoil	Stream What You Hear
Paid Paid app from Rogue Amoeba, with a free download to try before purchase.	Free Free and open source under the GPL-2.0 licence.
macOS	Windows
Sends audio from any Mac app, not only apps with built-in casting Plays to several speakers of different types in sync	Streams any audio playing on the PC, not just files Finds UPnP/DLNA renderers and starts playback in one click
The sending app runs on macOS only Paid software	Windows only Needs a UPnP/DLNA-compatible device or player to receive the stream
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
Not stated if an account is needed	No account 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 October 2, 2026

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