The deciding difference is operational: Langfuse can run on infrastructure you control, LangSmith cannot. If that constraint is real for you, it settles the choice before anything else is considered.
Open-source tracing, prompt management and evals. Self-hostable in one compose file.
Tracing, datasets and evals from the LangChain team.
| Langfuse | LangSmith | |
|---|---|---|
| Licence | Open source | Proprietary |
| Pricing | freemium | freemium |
| Self-hostable | Yes | No |
| Languages | Python, TypeScript | Python, TypeScript |
| Install | pip install langfuse | — |
| Keys required | LANGFUSE_PUBLIC_KEY, LANGFUSE_SECRET_KEY | LANGSMITH_API_KEY |
The deciding difference is operational: Langfuse can run on infrastructure you control, LangSmith cannot. If that constraint is real for you, it settles the choice before anything else is considered. Langfuse: Open-source tracing, prompt management and evals. Self-hostable in one compose file. LangSmith: Tracing, datasets and evals from the LangChain team.
Langfuse can run on your own infrastructure. LangSmith is a hosted service only.
Langfuse is open source (freemium). LangSmith 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-langsmith