Ask DN: Best mobile app prototyping tool for designers?

almost 10 years ago from , Designer at Square

Anyone know of a really intuitive, minimal service that allows you to either quickly sketch/create or import interface screenshots and animate the flows and patterns throughout. Looking to make my life easier when presenting things to the team that aren't as good at imagining how an experience might play out.

It'd be nice it was available both on the web and device, but not gonna being picky about it.