I found the first time I connected it, it set the iPad screen to be the main one, with the dock and menu bar over on the iPad. Within 2-3 seconds, the Mac will automatically detect the iPad and start using it as a second monitor. To use your iPad as a monitor, simply connect it to your Mac using a standard Lightning or 30-pin cable (I use an Amazon Basics one, mostly because it’s black …) and launch the Duet app on your iPad. On an iPhone 6, it would be pointless, and I’m not convinced it would be that much more useful on an iPhone 6 Plus, but the option is there if you want it. You need to restart your Mac after installing the companion app, and then you’re done. Install the Duet iOS app on your iPad, then install the companion menu bar app on your Mac. Built by ex-Apple engineers, I figured it ought to be work well, so put it to the test …
Instead of using WiFi, it feeds the video signal from your Mac to iPad using a standard Lightning or 30-pin cable. Second, even when they do work, there is an annoying amount of lag.
First, they often don’t work on WiFi hotspots, which you’re likely to be using when away from home. There are existing apps out there, like Air Display, that let you use an iPad as a second monitor for a Mac, but they work via WiFi, which poses two problems. Sure, I could get a 15-inch Retina MacBook Pro, but I favor physical screen space over smaller screen elements. When travelling, though, I have fewer pixels to play with. It’s the reason my primary Mac is still a 17-inch MacBook Pro, and why I have that hooked up to a 27-inch Apple Thunderbolt Display when I’m in my home office.
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