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AppVolume vs SoundSource: catalog facts
AppVolume	SoundSource
Free Free during early access; a paid release with a launch discount is planned.	Paid Paid app with a free download to try it before purchase.
macOS	macOS
Per-app volume from 0% to 200% Remembers volumes between sessions	Per-app volume and output device routing Audio effects and Audio Unit support for any app
macOS only Still in early access, with future pricing not yet set	macOS only Paid after the trial
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	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 1, 2026	Official website Full listing and sources Checked September 23, 2026

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