Ask HN: Review my app: Mockaroo, easily add interactivity to your mockup images

After years of explaining UI designs to clients over Skype, we decided to scratch our own itch. Mockaroo is a mockup simulation tool for turning UI designs/drawings into clickable prototypes. It is geared towards designers and entreprenuers: for designers to present image-based mockups to clients and get feedback, and for entrepreneurs to test out app ideas (add links to uploaded napkin drawings!) to a chosen audience.

Check it out, I'd appreciate any feedback.

http://mockaroo.com Demo: http://bit.ly/9cIUJv