Right now the goal is similar to that of cloud9 - provide an in-browser dev environment for quickly building apps; however, Napkin focuses on the serverless backend function and prototyping use cases. We want to streamline the UI to make writing and deploying Python and JS functions as quick as possible with 0 configuration. In the near future we will be adding some sharing/forking capabilities that we think will enhance this even further!
cloud9 ide is definitely a pioneer! We see Napkin as a part of the natural evolution in our productivity/dev tools, especially as we adapt to the advent of serverless architecture