Ask HN: Gui Design WebApp that makes all widgets look hand-drawn

I once saw a presentation of a webapp (it might've been at NY Tech Meetup, or maybe at some other startup-y thing) that allowed you to do GUI design inside the browser; the thing that stood out the most was that the actual widgets and windows looked like they were hand-drawn on paper. Does anyone know the name of that? They might've been YC-funded, but I am not sure of that.