6 years on, Code::Stats is still there and being updated. I just pushed release 2.3.0 (and 2.3.1 to fix issues) that has “flow state” tracking that tries to measure how much time you spent in a coding flow, i.e. a very focused state.
The profile page was rewritten in Phoenix LiveView, so I don’t have to spend time writing APIs and duplicate code for the frontend live updates. It was a great feeling getting to delete all those JS files! Chart.js still remains for rendering a couple of more complex charts. You can see the new profile page here: Code::Stats
This version also birthed one Hex package, to get colours of programming languages to display in the charts: LanguageColours - Get colours for programming languages
Everything is still (and will be!) open source, so feel free to check it out. But of course it has been evolving for 6 years now and I was a much worse Elixir programmer back then, so it’s a mish mash of different styles and different experiments… 
