This is the first application of this type that we have seen. It seems to be a wonderful way to interact with peers (or simply gather information about your own classroom) around the Standards for Mathematical Practice in the Common Core State Standards. My colleagues and I had a bit of trouble getting started with the app, but we received quick and easy to follow support from the creators! It is so easy to use and to create simple graphs of the data you gather. We recommend only working on one or two of the Standards at a time, which makes using the tool even more managable.
cmm15 about Common Core Look-fors (Mathematics, Technology, English Language Arts)