Once it’s set up and running, the iPad connects to the MacBook over Wi-Fi. Once installed on the iPad, it prompts you to install the host app on the Mac you want to use it with. I’m writing this in the local coffee shop with a two monitor setup.Īir Display is not cheap at $19.99 for the iPad ($9.99 for Android), but it’s cheaper and easier than buying and carting an external monitor around. I use it on the iPad Air, which serves as a second monitor for the MacBook Air. While it works on Android tablets, I haven’t tested it. It’s not the only option for turning a tablet into a monitor, but Air Display has evolved into a very good one. If you have an iPad or Android tablet, there’s an app that turns them into a good second monitor for a laptop. While laptops have evolved to have good resolution displays, sometimes you need as much screen real estate as you can get.