Braintrust
Eval-first AI engineering platform with logging, datasets, an LLM proxy and a purpose-built trace database (Brainstore), aimed at production regression-catching.
| Category | Evals & Testing |
| Open source | No |
| Self-hostable | Yes |
| Pricing model | freemium |
| Pricing notes | Free developer tier; usage-based paid plans; enterprise hybrid/self-hosted data plane |
| Framework integrations | openai-sdk, anthropic, langchain, vercel-ai |
| Funding / ownership | $36M Series A (a16z, 2024) + $80M Series B (ICONIQ, Feb 2026, ~$800M valuation) |
Pricing/feature source: https://www.braintrust.dev/pricing
Frequently asked questions
Is Braintrust open source?
No — Braintrust is a proprietary/commercial product.
Can I self-host Braintrust?
Yes — Braintrust can run in your own infrastructure.
How much does Braintrust cost?
Freemium. Free developer tier; usage-based paid plans; enterprise hybrid/self-hosted data plane