Computer-to-Mac — Connect your computers

What is Computer-to-Mac Mode?

Luna Display's Computer-to-Mac mode allows you to use a Mac as a second display for your primary Mac or PC.

Please note:
  • Luna Display supports the iMac as a Retina display when using it as a secondary Mac with some limitations. More here.
  • Luna Display supports the M1 Apple Silicon chip on Mac, though there may be some hardware limitations on the number of external displays allowed. Check Apple's device technical specifications to see what is compatible with your device. More here.

Connect your Computers using Wi-Fi

Connect both computers to the same Wi-Fi network.

If the computers are using different networks, they will not be able to find each other. You may connect via Wi-Fi or with an Ethernet or Thunderbolt connection.
Luna Primary Mac app icon Open the Luna Primary app on your Primary Computer.

The Luna Primary app has an icon with a grey and white cat.
- For macOS Mojave or later: enable Accessibility in System Preferences
- For macOS Catalina or later: enable Screen RecordingLuna Display does not record or save the contents of your screen.

Luna Secondary Mac app iconOpen the Luna Secondary app on your Secondary Mac.

The Luna Secondary app has an icon with a black and grey cat.

Both computers should automatically connect!

Connect your computers using USB, Ethernet, or Thunderbolt

Connect a USB, Ethernet, or Thunderbolt cable directly between your computers. You can also connect the Ethernet cable directly to your router.  You will still need to plug the Luna Display hardware into your primary Mac or PC alongside your preferred cable.

An Ethernet connection is recommended for PC-to-Mac mode. USB cable support is only available for Mac-to-Mac setups.

How do I use a USB, Ethernet, or Thunderbolt connection?


Using Manual Connect

Select Manual Connect on both the primary and secondary Luna apps.
Four sets of numbers will appear in the Luna app on your primary computer.

A similar four sets of numbers should also appear in the Luna app on your secondary Mac, but with a few missing digits.

Enter the last few digits of the number set from the primary computer into the secondary Mac to complete the number sequence.

Select Connect on your secondary Mac app after entering the numbers. Your computers should now be connected!

If the computers do not automatically connect:

  • check that both computers are connected to the same network
  • check that both computers are connected to the same wireless band (5GHz or 2.4GHz)
  • check that the correct apps are open on each computer
  • try Manual Wi-Fi Connect
  • try connecting with USB, Ethernet, or Thunderbolt
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