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SoundSource vs Background Music: catalog facts
SoundSource	Background Music
Paid Paid app with a free download to try it before purchase.	Free Free and open source under the GPL-2.0 licence.
macOS	macOS
Per-app volume and output device routing Audio effects and Audio Unit support for any app	Per-application volume control with boost above maximum Auto-pauses music when other audio plays
macOS only Paid after the trial	Still labelled alpha by its developer Auto-pause works only with supported music players
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	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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