The app is a tool that helps designers communicate with each other more directly and fluently. In this app, each whiteboard means a specific "task", and within a "task", a designer can commit his work(this maybe in the form of a picture or pdf), and invite others to share this work. Other designers joined this "task" can make comments and commit his/her own contents. This is totally a WYSIWYG(what you see is what you got) process. Everybody shares the same work, and makes his/her own comments. That why this app makes communication more fluently