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BlackHoleSound Siphon
Free

Free and open source. Hosting, hardware and any external services are separate.

 Paid

Paid, with a free trial; also offered as a Mac App Store subscription.

macOS macOS
  • Provides virtual audio input and output channels
  • Works with macOS audio routing
  • Captures audio from specific apps only
  • Virtual microphones usable in other audio apps
  • Requires configuration in the participating applications or Audio MIDI Setup.
  • macOS only
  • Mac App Store version needs an additional download for virtual inputs
Downloadable app Downloadable app
Open source Closed source
License: GPL-3.0 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

Checked September 22, 2026

Checked October 2, 2026

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