Braintrust

Braintrust is the category-defining platform for LLM evaluation, trusted by AI teams at Notion, Stripe, Vercel, Airtable, Instacart, Zapier, and Coda. It connects observability directly to systematic improvement through datasets, tasks, and scorers. Features include Loop AI agent for automated prompt optimization and dataset generation, Brainstore for 24x faster log querying, GitHub Actions integration for CI/CD evals, and voice agent support with audio debugging. Customers report 30%+ accuracy improvements and 10× development velocity gains.