[teleclimber]

Their pricing page shows that it has what appears to be a nice set of features to actually help you get better (note to site owner: might be an idea to put this on the main page).

Despite that I can't imagine myself typing code just for the sake of typing code. Seems to me this would make more sense as a plugin for an IDE. Watch my every keystroke as I do real work and show where I am constantly having to correct myself, and offer ways to prevent that.

[dmnd]

I'd definitely pay for a "typing analytics" addon to my OS, or maybe my editor, though I think that is needlessly restricting things. It depends if there are mistakes and advice that are specific to writing code versus just general typing.

Either way, it could watch for bad habits and common mistakes, show aggregating stats, etc.