It's a collaborative sketching tool; not a collaborative mockup tool. It remains flexible enough to play with visual concepts outside the restrictions of a UI

It's a collaborative sketching tool; not a collaborative mockup tool. It remains flexible enough to play with visual concepts outside the restrictions of a UI kit. That's a good thing in my book. I've actually been looking for a collaborative sketching tool for quite some time; but using terms like 'live whiteboard.' Seems closer to that.