This is a great app to quickly get started with the design process which tends to be a little tricky for developers who are more focused on coding aspect of project instead of designing.
One idea that might save designers a lot of time. The main focus, at least for me, is "most designs were not editable and unrelated to real-world products". Very important feature that i think does make a difference. Adding the fact that you can get a file source to better understand the "why?" and the "how?".
Pretty nice.
