Langfuse vs LangSmith

Side-by-side comparison of Langfuse and LangSmith: pricing, features, API access, and community ratings.

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	Langfuse Open-source AI engineering platform to debug, monitor, and improve LLM applications and agents Visit	LangSmith The end-to-end platform for building, testing, and monitoring LLM-powered applications Visit
Category	AI observability	AI observability
Pricing	Freemium	Freemium
Starting price	USD 29/mo
Free tier
Audience	Technical	Technical
API available
Open source
Self-hostable
Model provider		LangChain (model-agnostic)
Founded	2023	2023
Headquarters		San Francisco, USA
Key strengths	·Open source (MIT licensed) ·Self-hostable at scale ·LLM observability and tracing ·Prompt management	·Deep LangChain & LangGraph integration for zero-config tracing ·End-to-end LLM observability with detailed trace visualization ·Built-in evaluation and dataset management for regression testing ·Prompt management with versioning and A/B testing support