I think that in JS there is much more potential for interaction (as frontend IS JavaScript; for Python and other languages, it is this language + JavaSript). Ye

I think that in JS there is much more potential for interaction (as frontend IS JavaScript; for Python and other languages, it is this language + JavaSript). Yes, ipywidgets are hacks (as many other interactive things). So, I am surprised that there is no standalone REPL in that style. The closest things I've found are ObservableHQ and RunKit (the other is much more Jupyter-like, but still - AFAIK runs code in the backend).