Braintrust

Name: Braintrust
Author: Braintrust

Braintrust · Evals & observability

Evals, tracing and prompt playground.

Braintrust logs traces, scores them with evals and lets teams iterate on prompts; raised $80M in 2026 and is used by Notion, Stripe and Vercel.

Free · usage · Enterpriseused by 0+ Stack Open Braintrust ↗

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Evals & observability