You’ve probably seen the online hype around Duet — an OS X display extender app for iPad. Basically it’s supposed to allow you to extend your current desktop screen to an iPad — just as if you had an extra monitor. Other apps already do this, but Duet’s claim to fame is it will extend your desktop in a way that’s lag free. So if you’re watching movies or animation and moving elements between monitors, you’ll not notice lag.
Duet’s unique feature that allows this is that Duet connects to your Mac using the USB port and either 30 pin connector or Lightning connector.
I’ve previously used similar apps, Air Display and DisplayPad, though both have utilized WiFi to link your display to the computer. Also, both support Windows or OS X. Currently, Duet doesn’t support Windows.
Duet also doesn’t support the original iPad, where the two other apps do — a consideration if you have an older original hanging around, as I do.
Duet has been getting mixed reviews on the iTunes App Store, but that may be related to the high CPU usage needed to render out a retina display to a retina iPad — there’s a lot of work going on. If you’re using a new computer, or have a lower resolution iPad, then you may not encounter this issue.
Regardless, I’ll take a look at the app and report back when I’ve been able to give it a workout.