You can connect your GitHub account and see where you rank by total commit contributions.
It uses GitHub’s contribution data through GraphQL, so it is based on GitHub’s counting rules rather than raw git history. Private contributions can be included. Organization contributions only count if you grant org access during auth.
There is also a public read only API.
The main thing I learned building it is that commit counting sounds straightforward until you try to match how GitHub actually attributes contributions.
I’d be interested in feedback on whether commit contributions are the right ranking metric, and whether I should also support other contribution types.