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Vox installs a virtual microphone on macOS. Any app that lets you choose an input device can record from your Vox device, including apps that have never heard of Vox.
This is Mac only. iOS does not allow it. See Vox on Mac vs iPhone.

Guides for specific apps

Superwhisper

Wispr Flow

Willow Voice

Apple Voice Control

Selecting it

1

Make sure your device is connected

Open Vox and check the device status at the bottom of the left sidebar.
2

Enable Vox's virtual microphone

In Vox, select Settings in the left sidebar, stay on Basic, and find Other apps. Turn on Use Vox in other apps. The same section shows the driver install or reload action when one is needed.
3

Open the other app's audio settings

Look for Input, Microphone, or Audio source.
4

Choose Vox

Choose Vox.
Some apps, including Wispr Flow, hide virtual microphones such as Vox from their own input list. If Vox does not appear, set it as your Mac’s main input in System Settings → Sound → Input, then reopen the app.
The microphone activates on demand. When no app is listening, it does nothing, so leaving it selected costs no battery.

Where you will find the setting

Setting Vox as the system-wide input in System Settings affects every app at once, including ones you would rather leave on the built-in microphone. Setting it per app is usually the better move.

Troubleshooting

In Vox, select Settings in the left sidebar, stay on Basic, and open Other apps. If the driver is not installed, click Install Vox audio driver and then Install. If it is installed but macOS has not loaded it, click Reload Vox audio driver, then Reload audio. macOS may also require approval in Privacy & Security.
Check that the device is connected in Vox, and that the app has microphone permission in System Settings → Privacy & Security → Microphone.
In Vox, select Settings in the left sidebar, stay on Basic, and open Microphone. Speak normally while watching Input level, then adjust Input volume until it reads Good rather than Low or Loud.
Vox alerts you when the driver needs to be reinstalled or updated. Follow that prompt, or open Settings → Basic → Other apps and use the driver action shown there.