Impressive how nice this looks, and I am also impressed by how quickly it runs. I don't know who did this (could not find any "about" info), but kudos on a job well done.
However: Aside from the above, and doing it "because one can", I don't understand why anyone would spend the effort to make this. R is FOSS software, if you can run a web browser, you can run R itself. R is not hard to install or maintain. Running in a web browser requires network, and resources on someone else's machine.
So, I am a strange combination of impressed with this site and confounded trying to figure out why it exists. I'm probably missing something.
> Running in a web browser requires network, and resources on someone else's machine.
The site is running completely locally. You can disable your network in devtools and it will continue to work.
> I don't know who did this
I believe it's George Stagg https://github.com/georgestagg
Use case: teaching classes.
On HN, it seems trivial to install software, but for most people it is not.
Also, tablet and Chromebook users.