Kiln
Open-source AI workbench for teams to build, evaluate, fine-tune, and collaborate on LLM-powered products from a single desktop app.
About
Kiln is a team-focused AI workbench that covers the full lifecycle of building with large language models. Engineers use it to define reusable skills, connect tools and MCP servers, run RAG pipelines, and build sub-agents with structured outputs. Data scientists and QA teams run LLM-as-Judge evaluations, build golden datasets, generate synthetic training data, and fine-tune smaller models from results. A git integration keeps all prompt versions, evals, and human feedback in sync across the team. The desktop app installs on Mac, Windows, and Linux with one click. A free download is available, and enterprise pricing requires direct contact.