Kyso is kind of like nbviewer + binder.

With nbviewer you need to self host the notebook somewhere, and there are no profiles - so you can't keep all your work together.

With Kyso you can upload a notebook, import from github, or open Jupyter in the cloud and then publish your work, its all integrated.

nbviewer is a handy tool but it doesn't actually host your notebooks for you - you have to link from somewhere else (like Github). Binder hosts the Jupyter environments but has no publishing feature.

What we've tried to do is combine the features of Github (notebook hosting) and Medium so you can publish professional-looking blogs from directly within the Jupyter environment. We also support Jupyterlab, Jupyter's next-gen UI.

In effect, your entire data science workflow can be conducted on one central platform.