✓ Use when
Any team building on LangChain or LangGraph — LangSmith pairs seamlessly with no code changes. The path of least resistance.
✗ Avoid when
Teams not using LangChain — Langfuse is more framework-agnostic and has a better self-hosted story for non-LangChain stacks.
What is LangSmith?
LangSmith is LangChain's purpose-built observability and eval platform. Captures full LLM traces (including every step of a LangGraph agent), runs eval datasets, and manages prompt versions. Best experience when you're already using LangChain or LangGraph — drop-in integration with automatic span capture.
Key features
✓Automatic LangChain/LangGraph trace capture
✓Eval datasets with built-in scorers
✓Prompt hub with versioning
✓Human feedback and annotation UI
✓Self-hosted option for enterprise
Integrations
LangChainLangGraphOpenAIAnthropic
💰 Real-world pricing
What people actually pay
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