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Stream What You Hear vs Airfoil: catalog facts
Stream What You Hear	Airfoil
Free Free and open source under the GPL-2.0 licence.	Paid Paid app from Rogue Amoeba, with a free download to try before purchase.
Windows	macOS
Streams any audio playing on the PC, not just files Finds UPnP/DLNA renderers and starts playback in one click	Sends audio from any Mac app, not only apps with built-in casting Plays to several speakers of different types in sync
Windows only Needs a UPnP/DLNA-compatible device or player to receive the stream	The sending app runs on macOS only Paid software
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
No account 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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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