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Kiln

AI Coding Tools

A free desktop app and open‑source Python library for building, evaluating, optimizing, and deploying AI products.

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Python Latest v1.0.4 · 10d ago Security brief →

Features

  • Intuitive cross‑platform desktop app for Mac, Windows, and Linux with one‑click install
  • Eval Builder that auto‑generates evaluation datasets and aligns results in minutes
  • Auto‑Optimize automatically tunes prompts, models, tools, parameters, and subagents
  • Git‑native collaboration enabling non‑technical team members to rate outputs and add data
  • RAG, fine‑tuning across 60+ models, synthetic data generation, and multi‑agent hierarchies

Recent releases

View all 15 releases →
No immediate action
v1.0.4 New feature

Synthetic Batch Generation

Open
No immediate action
v1.0.3 Breaking risk

Input Transforms

Open
No immediate action
v1.0.2 New feature

Synthetic data guides + new models

Open
v0.28.0 New feature
Notable features
  • Kiln Chat assistant for AI system optimization
  • Automatic Git Sync for parallel team editing
  • Library support for streaming responses
Full changelog

Kiln Chat and Automatic Git Sync

What's New

  • Kiln Chat: A new chat/assistant panel in the app. Just ask, and Kiln can help you build and optimize any AI system. The assistant can help across all areas of Kiln, including RAG, Tools, Fine-tuning, Evals, Specs, Optimization, and more.
  • Automatic Git Sync: Team collaboration has never been easier. Kiln automatically syncs your project over Git so your whole team can make edits in parallel. No command line needed — a simple UI setup flow, then just use the app for instant syncing.
  • New Models: Kimi K2.6, GLM 5.1, Gemma 4, Opus 4.7, Qwen 3.6, MiniMax M2.7, Mistral Small 4, and many more.
  • And More: Library support for streaming responses, bug fixes, easier signup, and much more.

CI Build Source for this release Mac and Linux: /Kiln-AI/Kiln/actions/runs/24801094423
CI Build Source for this release Windows: /Kiln-AI/Kiln/actions/runs/24801094468

Full Changelog: https://github.com/Kiln-AI/Kiln/compare/v0.26.0...v0.28.0

View release on GitHub
v0.26.0 Breaking risk
Notable features
  • Agent Skills standard support for progressive information disclosure
  • Thinking level selection for reasoning models
Full changelog

Agent Skills Support

What's New

  • Skills: Support for the open Agent Skills standard. Skills allow progressive disclosure of additional information to your agent -- a great middle ground between context loading and RAG.
  • Thinking Level for Reasoning Models: You can now select the thinking level for reasoning models that support multiple levels. See the "Advanced" section of the Run screen.
  • New Models: GPT 5.4, GPT 5.3 Instant, Qwen 3.5 variants
  • And More: Improved error UI, SDK improvements (runs are no longer saved by default), deprecated models hidden in UI, improved fine-tuning for tool use

CI Build Source for this release Mac and Linux: /Kiln-AI/Kiln/actions/runs/23250506105
CI Build Source for this release Windows: /Kiln-AI/Kiln/actions/runs/23250506230

Full Changelog: https://github.com/Kiln-AI/Kiln/compare/v0.25.0...v0.26.0

View release on GitHub

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About

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Forks
374
Languages
Python Svelte TypeScript
View on GitHub Homepage Documentation

Install & Platforms

Platforms
macos windows linux

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Beta — feedback welcome: [email protected]