[Note: This tip was originally published in my newsletter]
If you’ve ever wanted to tinker with that Great App Idea with something more than doodling tools, check out ProtoSketch for iPad and iPhone. It’s a design app for everything from sketching to logos, but it also has templates with typical interface tools. It’s pretty easy to build a few example screens to visualize your idea and share it with others. There is also a free Lite version, with a max of five documents and other restrictions.