What is Buildermark?
Buildermark is a powerful, open-source tool designed to track and analyze the extent to which coding agents contribute to software development projects. It matches agent-generated edits against git commit diffs, offering insights into the proportion of automatically generated versus manually written code. The tool supports multiple AI coding assistants like Claude Code, Codex, Gemini, and Cursor, making it versatile for different workflows. Buildermark is local-first with no analytics or tracking, ensuring privacy and control over your data. It can be run locally by opening a frontend at localhost:55022 after importing the project details. A browser extension is also available to streamline imports from cloud-based coding agents.
What is Buildermark used for?
AI tool for creators toolkit workflows
How much does Buildermark cost?
Pros and cons
Pros
• Tracks exactly what percentage of your codebase was generated by AI vs written manually • Supports Claude Code, Codex, Gemini, and Cursor for broad multi-agent compatibility • Fully local-first with zero analytics, tracking, or external data transmission • Browser extension available to streamline imports from cloud-based coding agents • Open-source and free — self-host with no usage costs
Cons
• Local-only dashboard — no cloud sharing for team reporting • Requires a git repository with commit history for accurate diff matching • Limited to AI agents explicitly supported by the tool • Browser extension dependency may add friction for some workflows
Questions about Buildermark
What is Buildermark?
Buildermark is an open-source tool that measures how much of your project's code was generated by AI agents like Claude Code, Codex, Gemini, and Cursor by matching agent edits against git commit diffs.
Which AI agents does Buildermark support?
Buildermark supports Claude Code, Codex, Gemini, and Cursor out of the box.
Is Buildermark free?
Yes. Buildermark is free and open-source.
Does Buildermark track or send my data anywhere?
No. Buildermark is strictly local-first with no analytics, telemetry, or external data transmission.
How does Buildermark calculate AI-generated code?
It matches agent-generated edits against git commit diffs to calculate the proportion of AI-authored versus manually written code in your project.
What are the best alternatives to Buildermark?
Compare this tool against close alternatives in the same category, focusing on output quality, onboarding speed, and workflow fit.
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