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swyh-rs vs Airfoil: catalog facts
swyh-rs	Airfoil
Free Free and open source under the MIT licence.	Paid Paid app from Rogue Amoeba, with a free download to try before purchase.
Windows, Linux	macOS
Sends any desktop audio to DLNA and UPnP renderers Written in Rust and actively maintained	Sends audio from any Mac app, not only apps with built-in casting Plays to several speakers of different types in sync
Only works with DLNA or UPnP capable receivers Network streaming adds some latency	The sending app runs on macOS only Paid software
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	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.