BlackHole

You want to send one app's audio to another or capture system sound, but the system has no such channel. BlackHole builds it: an open-source zero-latency virtual audio input/output driver, create a virtual sound device, route audio signals between apps, and with recording software capture system audio, indispensable for streaming, voiceover recording and audio routing. A macOS app, open source.

Features

Virtual device: Zero-latency virtual audio I/O.

Audio routing: Route audio between apps.

System capture: Capture system audio with recorders.

Open and free: An open-source project, free to use.