View your changes instantly. Work directly with the final representation of your site. Every change you make happens right away. Your CSS will be color-coded, formatted and line-numbered for easy reference and readability. DevKit is a HUGE time saver. Remove the need for an IDE, save time, and edit your site, theme or client project from any PC at your disposal! Toggle between three responsive states. Responsive states allow you to customize CSS for desktop, tablet and mobile views at the click of a button.