Thanks for contacting us. We actually haven’t tested on the Playbook, but any device running Flash can run Ribbet. Ribbet can even be used on iOS devices using a Flash-supporting browser such as Puffin. When Ribbet is used on a touch device however, as it’s optimized for use with a mouse, various things don’t work as well (things like drag/drop, painting etc). Also, Flash doesn’t perform as effectively on most mobile devices as it does on a desktop/laptop.
We definitely have plans to roll out apps for Ribbet, and these are under development. We don’t have a schedule for when they will be released, and we’re focused on creating a quality product for the long term (so I can’t give you any launch dates just yet).