LangSmith

Tracing, evals and monitoring for LLM apps and agents.

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Pricing

Model: freemium
Starting price: Not listed — check the vendor site

Niches

Best for

Trace, debug and evaluate agents

▸ Native for LangChain/LangGraph, works framework-agnostic.

Related use cases

Run agent-generated code in a sandbox Build an AI agent in code Build agent workflows without coding Launch a phone/voice AI agent