iPhone XS Max: Super Retina HD (2688 x 1242, 458ppi).iPhone XS: Super Retina HD (2436 x 1125, 458ppi).iPhone, iPhone 3G and iPhone 3GS: non-Retina.If Steve Jobs’ assertion was right and 300ppi on a smartphone is enough to make pixels invisible, then squeezing in more pixels would seem to be redundant. Whether there’s any point in having 4K and QHD resolutions on a smartphone is debatable. And Samsung’s Galaxy S6 has a resolution of 1440 x 2560 pixels – known as Quad HD or QHD – on a 5.1in screen, giving it a pixel density of 577ppi. But several makers of smartphones and tablets, in particular, have displays with pixel densities which are at least a match for Apple’s devices, and in some cases far exceed it.Įxamples include Sony’s Xperia Z5 Premium which has a resolution of 3,860 x 2,160 pixels – just shy of 4K – on a 5.5in screen, giving it a pixel density of a monstrous 806ppi. No other manufacturer uses the Retina branding – Apple’s lawyers would soon have something to say if they did. In October 2015, it launched a 21in iMac with a horizontal resolution of 4096 pixels (and a pixel density of 218ppi), and called its display Retina 4K. So when Apple launched a 27in iMac with 5,120 horizontal pixels in 2014, it used the same naming convention and called it Retina 5K.
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