How can we help?

Find answers to common questions below, or reach out directly — we're happy to help.

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Quick Start

Getting started with MultiViewer

  1. 1 Launch the app — the Control Center window appears
  2. 2 Click a device from the list, then choose "New Virtual Monitor"
  3. 3 The video feed starts automatically in its own window
  4. 4 Resize, move, and tile windows however you like
  5. 5 Add more devices or monitors — there's no limit

Frequently Asked Questions

First, make sure the app has camera permission — go to System Settings → Privacy & Security → Camera and ensure MultiViewer is enabled. If you're using an external camera or capture card, try unplugging it and plugging it back in. You can also click the "Refresh" button in the Control Center. Some USB capture devices may need their own drivers installed.
macOS typically allows only one app or capture session to use a camera at a time. You can add a device to one virtual monitor window, but it may not be available for a second simultaneous session. If you need multiple views of the same source, consider using a capture card with loop-through or a video splitter.
There's no software limit — you can open as many virtual monitor windows as you want. The practical limit depends on your Mac's CPU, GPU, and the resolution of each video feed. If performance dips, try reducing the number of active high-resolution streams.
MultiViewer works with any video input device that macOS recognizes through AVFoundation. This includes built-in Mac cameras, most USB webcams, Elgato capture cards, and other UVC-compatible devices. If macOS can see it in Photo Booth or FaceTime, it should work in MultiViewer.
Some capture cards, especially game capture devices, need a moment to initialize. MultiViewer includes a built-in delay for these devices, but if you still see a blank feed, try removing the device from the monitor and re-adding it. Also make sure your source device (console, PC, etc.) is actively outputting a video signal.
No. We don't collect, store, or transmit any personal data, usage analytics, or telemetry. Everything runs locally on your Mac. Read our full Privacy Policy for details.
MultiViewer requires macOS 13.5 (Ventura) or later.