In my experience, teams rarely notice knowledge concentration until someone is out and delivery slows down. This tool makes that risk visible early by turning commit history into a simple heatmap per group and repo. More on why I created it.

Run it on your codebase

You can find the script, install instructions and usage on github:

https://github.com/nkrijnen/git-knowledge-heatmap

Live demo on a “real” portfolio below.