Langfuse vs LangSmith

Compare Langfuse and LangSmith on deployment, pricing, model support, and more.

Langfuse

Tagline: Open-source LLM observability — tracing, evaluation, and prompt management
Description: Langfuse is an open-source LLM engineering platform for tracing, evaluation, and prompt management. Self-host it for complete data control or use Langfuse Cloud. Works with LangChain, LlamaIndex, OpenAI SDK, and any custom LLM stack via a simple Python/JavaScript SDK.
Category: LLM Frameworks
Pricing: Free
Metric: 34,469 GitHub stars (source)
Link: Visit

Tagline: Debug, test, and monitor LLM applications built with LangChain or any framework
Description: LangSmith is LangChain's LLM application observability and evaluation platform. It traces every LLM call, chain step, and agent action, providing full-stack visibility into what your AI app is doing. Run automated evaluations, compare prompt versions, and catch regressions before they reach production.
Category: LLM Frameworks
Pricing: Freemium
Metric: 500 Traces processed per month (millions) (source)
Link: Visit

Attribute	Langfuse	LangSmith
Tagline	Open-source LLM observability — tracing, evaluation, and prompt management	Debug, test, and monitor LLM applications built with LangChain or any framework
Category	LLM Frameworks	LLM Frameworks
Pricing	Free	Freemium
Description	Langfuse is an open-source LLM engineering platform for tracing, evaluation, and prompt management. Self-host it for complete data control or use Langfuse Cloud. Works with LangChain, LlamaIndex, OpenAI SDK, and any custom LLM stack via a simple Python/JavaScript SDK.	LangSmith is LangChain's LLM application observability and evaluation platform. It traces every LLM call, chain step, and agent action, providing full-stack visibility into what your AI app is doing. Run automated evaluations, compare prompt versions, and catch regressions before they reach production.
Metric	34,469 GitHub stars (source)	500 Traces processed per month (millions) (source)
Link	Visit	Visit