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Piezo vs Sound Siphon: catalog facts
Piezo	Sound Siphon
Paid Paid app with a free download to try it before buying.	Paid Paid, with a free trial; also offered as a Mac App Store subscription.
macOS	macOS
Records audio from almost any Mac application or input device Saves call participants to separate channels	Captures audio from specific apps only Virtual microphones usable in other audio apps
macOS only Paid after the trial	macOS only Mac App Store version needs an additional download for virtual inputs
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is 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 September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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