CodeBurn is a free, open-source tracker for AI coding costs. It reads the session files your tools already write - Claude Code, Cursor, Codex, Copilot, 40 in all, and shows every token and dollar by the task, model, project, and pull request that used it.

AI coding tools don't tell you where your money goes. The bill shows a total, and that's it. Which model? Which project? Was it work that shipped, or an agent re-reading the same file over and over?

The thing is, the answer already exists. Every AI coding tool Claude Code, Cursor, Codex, Copilot, and 36 more writes detailed session logs to your own disk. Nobody was reading them. CodeBurn reads them.

Here's everything it does:

Understand your spend

• Every token and dollar broken down by task, model, project and by pull request, so you see which PRs your budget actually shipped

• A spend punchcard: which hours and weekdays you burn the most

• Session browser with titles, so you find work by what it was about

• Workflow insights: how often you correct the AI, how long until it makes its first edit, which files it keeps reworking

Cut your spend

• Optimize finds the waste: cache bloat, retry tax, expensive models doing work a cheaper one handles fine

• It applies the fix for you and tracks what the fix actually saved. Undo included

• Compare any two models on your own real usage: cost per edit, one-shot rate

• Budgets with warnings, subscription plan and overage tracking, live quota windows

Wherever you work

• CLI: one command, full dashboard in your terminal

• Desktop app for Mac, Windows, and Linux; nothing else to install; the engine is bundled

• macOS menu bar: today's burn always visible, with forecasts and quota pace • Web dashboard served from your own machine

• GNOME panel extension for Linux • All of them read the same local data, so they always agree

Built on two rules

• Honest: when a cost is estimated instead of exact, it says so

• Yours: open source, MIT license, no account, nothing ever leaves your machine. Genuinely free