Mock up an application and show what's important:

the idea, the information, the interaction

Mock up your idea fast

Drag and drop UI elements to the page, then rearrange and resize
Go from idea to mockup in minutes

Link and click between pages

Link multiple mockups together and preview them interactively to get a feel for the flow of your application

Share a link, and clients and teammates can edit wireframes with you in real time
No more emailing images back and forth