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SoundSource vs Volume Control: catalog facts
SoundSource	Volume Control
Paid Paid app with a free download to try it before purchase.	Free Free and open source under the GPL-2.0-or-later licence.
macOS	Linux
Per-app volume and output device routing Audio effects and Audio Unit support for any app	Separate volume control for each application Per-device volume adjustment
macOS only Paid after the trial	Linux only Built around the PulseAudio sound system
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0-or-later
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.