Kiln AI Logo
Build, Evaluate, and Optimize AI Systems
Everything you need to build better AI products
Evals • Synthetic Data • RAG • Agents • Fine-tuning • Datasets
Open-source library + free app
10,000+
Users
4,500+
Github Stars
3M
Alibaba
Apple
ByteDance
Fidelity
GitHub
GitLab
IBM
Intel
Lego
Meta
Microsoft
Netflix
NVIDIA
Sony
Stanford
Tencent
Tesla
Twitch
3M
Alibaba
Apple
ByteDance
Fidelity
GitHub
GitLab
IBM
Intel
Lego
Meta
Microsoft
Netflix
NVIDIA
Sony
Stanford
Tencent
Tesla
Twitch

Trusted by engineers at companies worldwide

Everything You Need
to Build Better AI Products

All the tools you need—integrated and easy to use.

Fine Tuning

Create custom models, tuned to your use case. Deploy in seconds.

Synthetic Data

Generate data for training and evaluation, with interactive controls.

Evals

Evaluate, align to human preferences, and iterate with confidence.

Agents

Build agentic systems with multiple actors.

Docs & Search (RAG)

Extract and search documents for RAG (Retrieval-Augmented Generation).

Tools & MCP

Add tools and MCP servers to your agents to enhance capabilities.
And much more: human ratings, reasoning models, automatic prompt generators, JSON support, error repair, Git collaboration, open source Python library. Read the docs.

Measure, Improve, Repeat

Find the best AI system for your problem—evals with built-in optimization tools.

Supercharge Your Team

Make AI quality a team effort. Move fast with confidence.
Git icon

Git Collaboration

Share datasets via Git or shared-drives. Powerful familiar tooling you already use.

PM, QA & Design

Contribute to the quality of models without coding. Use evals, data generation, ratings, and more.

Engineers

No limits on deployments. Run on any cloud platform or locally. Open-source Python library.

Data Scientists

Try new models and techniques in seconds. Replace vague specs and bug reports with evals, golden data, and ratings.

Run Any Model
Any Way

Local or remote - the choice is yours.
Connect to Ollama, OpenAI, OpenRouter, AWS, Azure, Vertex, Together, Fireworks, and more.
Skip the guesswork — we've tested every model's capabilities.
Model Library
Kiln

You're in Good Company

People in our community.
Logos of our community
Kiln is super intuitive. We had working fine-tunes in no time using Kiln's synthetic data gen and fine-tuning tools.
Leonard Marcq
CTO
Kiln has increasingly become our go-to tool for new research. The fine-tuning, synthetic data, and evals have been invaluable.
Shaina Raza, PhD
ML Scientist, Vector Institute for AI
Super cool repo!! Love the mini-video tutorials.
Daniel Han
CEO, Unsloth
I'm just getting into AI engineering. With Kiln I created working fine-tunes from scratch. The tooling and docs are top notch. Highly suggest trying it out.
Damien Ostler
Software Engineer, Data443.com
This isn't just tooling - it's MOAT [...] 90% faster than manual tuning
Lucas Jin
Founding Engineer, Eddi
Kiln is super intuitive. We had working fine-tunes in no time using Kiln's synthetic data gen and fine-tuning tools.
Leonard Marcq
CTO
Kiln has increasingly become our go-to tool for new research. The fine-tuning, synthetic data, and evals have been invaluable.
Shaina Raza, PhD
ML Scientist, Vector Institute for AI
Super cool repo!! Love the mini-video tutorials.
Daniel Han
CEO, Unsloth
I'm just getting into AI engineering. With Kiln I created working fine-tunes from scratch. The tooling and docs are top notch. Highly suggest trying it out.
Damien Ostler
Software Engineer, Data443.com
This isn't just tooling - it's MOAT [...] 90% faster than manual tuning
Lucas Jin
Founding Engineer, Eddi

Frequently Asked Questions

Pricing? (it's free!)

Kiln is currently completely free.

The Python library is open source, under the MIT license.

At a later date, we may charge for-profit companies for some features of the desktop app.

Is it Private? (yes, Kiln is local software)

Kiln is local software that runs on your computer, not the cloud. Your dataset is stored locally on your own hard drive.

We don't have access to your dataset, and couldn't access it even if we wanted to.

All of Kiln's source code is on GitHub. Anyone can verify these privacy claims. Kiln's binary builds are built from the public source code, on public CI servers (Github Actions), and have verifiable checksums.

Kiln does have usage analytics in the UI via Posthog. Analytics never include data from your dataset or API keys. Analytics are not associated with your identity, unless you explicitly opt-in to commercial usage of Kiln.

If you use Kiln with API keys (for example, OpenAI or OpenRouter), requests are sent directly from your computer to the API provider. We can't see your keys or any data from those requests.

What license is Kiln under?

Our Python library is open source, under the MIT license.

Our desktop app is source-available (you can read 100% of the code on Github). It's free to use under our end user license agreement, and has a proprietary license.

How do I contact you?

There are a few ways to get in touch:

Who made Kiln? Why?

Check out the about page!

How can I stay updated? (Blog, Newsletter)

We publish a newsletter with updates about Kiln (new releases, new features, Kiln news, etc).

You can also subscribe to the Kiln AI Blog (yes, RSS is still cool).

Get Kiln Updates in Your Inbox
Zero spam, unsubscribe at any time.
Or watch our end to end project demo (20 minutes).