Unlike its competitors that rely on wi-fi for their connectivity, Duet uses a standard USB/Lightning cable. With a tether, you can even watch 1080p videos at 60 fps. Prior versions of the software allowed for only a single second screen but with the new 1.2 version of Duet, users can now take advantage of iOS’s split-screen capabilities (when tethered to a Mac) an allocate two-thirds of the display for Mac apps, while the other third can be used for your favorite split-screen iOS apps. The split screening only works on iPad Air 2 or iPad Pro.
Duet is available from the Apps Store for $9.99. It’s a bit pricey as apps go, but an inexpensive investment in a road warrior’s kit.