Loopback is not available for Windows but there are some alternatives that runs on Windows with similar functionality. The best Windows alternative is VB-Audio VoiceMeeter, which is free. If that doesn't suit you, our users have ranked more than 10 alternatives to Loopback and seven of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Loopback are JACK Audio Connection Kit (Free, Open Source), VB-Audio Virtual Cable (Freemium), Virtual Audio Cable (Paid) and Dante Via (Paid).
JACK is a professional sound server daemon that provides real-time low latency connections for both audio and MIDI data between applications that implement its API. The API can be used through either JACK1 or JACK2.
JACK Audio Connection Kit vs Loopback opinions
Some users think JACK Audio Connection Kit is a great alternative to Loopback, some don't.
ubster super lite and opensource, also paying attention to latnecy
VB-Audio CABLE is a Windows Audio Driver working as a Virtual Audio Cable. After installing the VB-CABLE driver, a new playback device appears in the audio device list and can be set as default device. VB-CABLE can be set as the default device, just like any regular audio device.
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VB-Audio Virtual Cable vs Loopback opinions
pros, cons and recent comments
IanDorfman Though only available on Windows, VB-Audio Virtual Cable offers equivalent functionality to what Loopback offers macOS, with support for audio signal routing and passthrough, recording, and multichannel support.
Synchronous Audio Router is a software-based audio routing driver for Windows. You can create any number of Windows audio endpoints, either playback or recording, and route them using any digital audio workstation software which supports ASIO, all with low latency.