These tools competes with

LangSmithvsLangfuse

LLM tracing, evaluation, and dataset management versus OSS LLM engineering platform (acquired by ClickHouse, Jan 2026)

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Choose LangSmith when…

  • •You're already in the LangChain ecosystem
  • •You want end-to-end tracing for LangChain apps
  • •Dataset management and evals are part of your workflow

Choose Langfuse when…

  • •You want open-source LLM observability
  • •Self-hosting your tracing stack is important
  • •You need cost tracking across models and users

Side-by-side comparison

Field
LangSmith
Langfuse
Category
Observability
Observability
Type
Commercial
Open Source
Free Tier
✓ Yes
✓ Yes
Pricing Plans
Plus: $39/mo
Cloud: $59/mo
GitHub Stars
—
⭐ 7,000
Health
—
●95 — Active

LangSmith

LangChain's observability platform. Trace every LLM call, run evals on datasets, and manage prompts in production.

Website ↗

Langfuse

Open-source platform for tracing, evaluations, and prompt management. Self-hostable alternative to LangSmith with broad framework support. Acquired by ClickHouse in January 2026; OSS core continues with deeper ClickHouse-backed analytics.

Website ↗GitHub ↗

Shared Connections7 tools both integrate with

CursorLangGraphLangChainHeliconeBraintrustWeights & BiasesAgentOps

Only LangSmith (2)

PydanticAILangfuse

Only Langfuse (24)

Claude CodeCrewAIOpenHandsAutoGenLlamaIndexDifyMastraAgnoLiteLLMLangSmith

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