iDisplay 4+

Turn your iPad or iPhone into an additional display for your Mac or Windows computer.
Works with both, Lightning and 30-pin cable (with almost 0 latency!) connection or Wifi on OS X!
Increase your personal productivity by extending your computer screen by 44%! Perfect tool for multitaskers, iDisplay lets you use your iPad, iPhone or iPod touch as an interactive wireless display to give you more screen real estate. You can connect up to 10 devices to one computer! Works with up to 60fps!
Recommended by Kim Komando, tech guru of USA Today.

"iDisplay app turns your iPad or iPhone into secondary screen – too good to be true. That's... brilliant. I mean, I can think of about a billion uses for this." ­MobileCrunch
"Yet another reason to buy an iPad: iDisplay" ­MobileWhack

Why choose iDisplay over hardware display?

Your iPad, iPad Pro, iPhone and iPod touch can be your secondary display
Works with both Mac and Windows computers
iDisplay lets you interact with your additional display: move objects, draw, control playback
Pan and zoom your desktop right on iOS device
Easily switch between portrait and landscape screen orientations: simply rotate your device and it will adjust automatically
Normal and double resolution modes for Retina displays
Connect multiple devices to one Mac, select their layout once and use it anytime later
Customize display settings for each device you use as your secondary display, iDisplay will remember your preferences
Create a list of favorite apps which you regularly use on iDisplay and move them to iDisplay with one click!

On Mac OS X you can choose one of 3 following iDisplay modes:
Use iDisplay as regular secondary display: gives you more screen space for everything you have to keep your eye on.
Mirror image from main display on your iPad / iPhone / iPod touch: comes in handy when you need to share your desktop with your audience. Keep in mind that iDisplay allows to connect multiple devices to one Mac! Yes, lots of them! Many colleges use iDisplay.
Single­window mode: use iDisplay for one application of your choice. Quickly move selected apps from list of your favorite apps to iDisplay with one click!

On Windows, iDisplay can be used as regular secondary display, mirroring and single­window modes are not yet supported.

COMPATIBILITY:

Mac OS X
iDisplay Desktop application needs to be installed on your Mac.
iDisplay Desktop is free and can be downloaded anytime at getidisplay.com
iDisplay is compatible with Macs with Intel CPUs running on Mac OS X 10.5 and later. El Capitan supported!

WINDOWS
iDisplay Desktop application needs to be installed on your PC.
iDisplay Desktop is free and can be downloaded anytime at getidisplay.com
iDisplay is compatible with Windows XP (32­bit only), Windows Vista (32­ and 64­bit), Windows 7 (32­ and 64­bit), Windows 8 and Windows 10.

For Windows Vista and Windows 7 "Aero" theme may be disabled when connected to iDisplay and will be re­enabled upon disconnection).

NETWORK CONNECTIVITY
Your computer and iOS device must be connected by cable or to the same Wi­Fi network.