Show HN: Buildermark – See how much code is by your agents (open source, local)

[davidcann]

I made Buildermark to see exactly how much of my code is generated by my coding agents vs what I was writing by hand. For this project, it ended up being 364 agent conversations writing 94% of the code. Browse all of those here: https://demo.buildermark.dev/

It matches edits by your coding agents (scans history in `~/.claude`, '`/.codex', etc.) with git commit diffs. It does formatting-agnostic matching to be robust against auto-formatting and reorganizing code. It's open source and local only, not even any analytics.

Everything is automatic... just run the app, open the localhost:55022 frontend, and choose the project to import.

It supports Claude Code, Codex, Gemini, and Cursor, so far. There's also a browser extension to import from cloud agents.

https://buildermark.dev

I'm also working on a Team Server to aggregate results and make the project sustainable.