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Background Music vs Sound Siphon: catalog facts
Background Music	Sound Siphon
Free Free and open source under the GPL-2.0 licence.	Paid Paid, with a free trial; also offered as a Mac App Store subscription.
macOS	macOS
Per-application volume control with boost above maximum Auto-pauses music when other audio plays	Captures audio from specific apps only Virtual microphones usable in other audio apps
Still labelled alpha by its developer Auto-pause works only with supported music players	macOS only Mac App Store version needs an additional download for virtual inputs
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
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 October 2, 2026

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