Kiln

Kiln is an AI development platform for building, evaluating, and optimizing AI systems.

Kiln is an AI development workbench designed to help teams build, evaluate, and optimize AI systems. The platform provides tools for evaluation, retrieval-augmented generation, agents, synthetic data generation, fine-tuning, and prompt optimization. Users can index and retrieve data, compose tools and sub-agents, translate intent into evaluations, and auto-tune prompts. Datasets are versioned directly in git repositories, and the system supports collaboration across the entire team. It operates via a desktop app and an open-source MIT-licensed Python library, supporting both cloud and local models.

Kiln at a glance

Best for: Software engineer
Runs on: Web, macOS, Windows, Linux, API, open source
Pricing: Free for individuals; Team plan available; Enterprise tier with custom pricing
Released: March 2025
Category: AI coding tool
Website: kiln.tech

Key features

Run experiments through conversation
Auto-tune prompts to evals
Generate, filter, and label synthetic data
Distill into smaller models
Score every change across axes
Version datasets in your repo
Deploy using Python library

Use it for

Optimize AI prompts and agent designs
Generate evaluation datasets and LLM judges
Fine-tune models and distill into smaller ones
Track quality across model upgrades and prompt changes

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