Langfuse is open source and Braintrust is not, so the question is whether you want source access and the option to fork, or would rather have a vendor accountable for it.
Open-source tracing, prompt management and evals. Self-hostable in one compose file.
Eval-first platform — scorers, datasets and a playground for prompt iteration.
| Langfuse | Braintrust | |
|---|---|---|
| Licence | Open source | Proprietary |
| Pricing | freemium | freemium |
| Self-hostable | Yes | Yes |
| Languages | Python, TypeScript | Python, TypeScript |
| Install | pip install langfuse | — |
| Keys required | LANGFUSE_PUBLIC_KEY, LANGFUSE_SECRET_KEY | BRAINTRUST_API_KEY |
Langfuse is open source and Braintrust is not, so the question is whether you want source access and the option to fork, or would rather have a vendor accountable for it. Langfuse: Open-source tracing, prompt management and evals. Self-hostable in one compose file. Braintrust: Eval-first platform — scorers, datasets and a playground for prompt iteration.
Langfuse can run on your own infrastructure. Braintrust can run on your own infrastructure.
Langfuse is open source (freemium). Braintrust is proprietary (freemium).
Every page here answers to Accept: text/markdown and returns the same content at roughly a tenth the tokens. No separate site, no toggle — same URL.
curl -s -H "Accept: text/markdown" https://newagent.build/compare/langfuse-vs-braintrust