STEP 1: Get the client app

(On your secondary device or computer)

iOS: Get Air Display 3 from App Store

Android: Get Air Display 2 or Air Stylus for Galaxy Note from Google Play

macOS: Get Air Display for Mac from avatron.com

Windows: Get Air Display for Windows from avatron.com

STEP 2: Get the host software.

(On your main Mac)

Download Air Display Host