Is This Retina?

This tool calculates how much distance you need to put between yourself and your device for it to look “Retina” (i.e. you can no longer tell the difference in quality), given the screen resolution and diagonal screen size.

Thanks to the original tool for the inspiration (and the calculation code which I shamelessly lifted with DevTools). This tool has updated definitions for newer devices and re-calculates immediately when the values change.

Want to contribute more devices to the preset dropdown? Add them here with a pull request!