I am about to embark on developing a mobile application for both the iPhone and the Android based phone. I have most of my gui mock ups written down on a white board and some in my head. I need to put them down on paper so I can relay my designs to others in my team. I was wondering what the best on-line gui mockup tool I could use?
I have a lot of experience with Visio and I truly like it. I want a tool that would be web based so I could collaborate with others on the team.
Does anyone have a suggestion for an easy gui mockup tool that I could use?