Balsamiq Wireframes (formerly Mockups) is a rapid wireframing tool that helps you work faster & smarter. It reproduces the experience of sketching on a whiteboard, but using a computer. The first impression might be disorienting. There are very few interface elements on the screen. Start exploring however, and you'll find out that Wireframes is filled with powerful yet only-visible-when-you-need-them features. Getting your ideas out should be effortless. We sweat the details so the app gets out of your way, instead of forcing you to learn it. You won't see many dialog windows interrupting your flow, and you won't have to twiddle with options all the time.