Monochrome is an OS X Web browser with a fixed viewport that matches the resolution of an iPhone 5; it basically puts a mobile browser on your desktop. It’s hardly an earth-shattering idea, but even in its simplicity I think it’s quietly profound. It can be really difficult to think about the mobile web when you’re staring at the desktop web all day. Putting a company’s mobile site right in a window alongside all the windows on your desktop can be transformative for organizations still struggling with that transition.