Live Preview makes it easy to mirror your Sketch designs on your iPad and iPhone. Using the same wireless technology as AirDrop, Live Preview works anywhere—even when your devices aren't connected to the internet.  Live Preview features stunning pixel perfect @3x previews, as well as Automatic Update, which dynamically changes the preview, following you as you work. Quick Compare allows for instant switching between the last two artboards—very useful for proofing subtle design changes. Live Preview works with any Sketch document, stored locally or in the cloud.