… is a nifty HTML5 App used to create wireframes, mockups or UI concepts, prototypes depending on how you like to call them.

Easily create mobile web app mocks you can share, test on multiple platforms, and use in production. Beta. Really. Incomplete and contains bugs. But have fun already.

… wireframing, mockups and prototyping for websites and applications

Wireframes on the fly … an online tool that makes it easy for you to create, link together, preview, and share mockups of your website or application.