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Evalite

Test GenAI-powered apps in TypeScript

Evals are hard. Evalite makes them simple. Test your AI-powered apps with a local dev server. No API key required.
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Features

Just A Test Runner

.eval.ts is the new .test.ts. Write evals in TypeScript with an instantly familiar API.

Instant Feedback

Explore your outputs, traces and logs in a beautiful, interactive UI that runs on localhost.

Built on Vitest

Works out of the box with your stack. Use mocks, fixtures, and more to simulate real-world scenarios.

No Vendor Lock-In

Work with any LLM, and test outputs against each other seamlessly.

Put Away Your Credit Card

No cloud platform. No API key. Your data stays on your machine. No sign-off needed.