For wire-framing or diagrams I find pen and paper (or a whiteboard) to be the best solution too. Too often most of the effort goes into "properly" using the app

For wire-framing or diagrams I find pen and paper (or a whiteboard) to be the best solution too. Too often most of the effort goes into "properly" using the app, when it should be spent on the concept. Just draw a picture, take a photo and email it or whatever, and done.