It’s still early days for the retina/hi-dpi display but it’s pretty clear that it’s here to stay. Many designers, myself included, have begun adopting new retina techniques ready for the ever expanding range of high-resolution devices being launched.
But, you’re anything like me, you might wish to track just how many of your visitors are actually browsing your sites(s) with a retina screen. Thankfully by registering a Custom Variable within Google Analytics, you can do exactly that.
Register the Custom Variable
What to expect within Google Analytics