LangSmith

Free tier

The end-to-end platform for building, testing, and monitoring LLM-powered applications

Free tier available·Technical·Powered by LangChain (model-agnostic)·API available

Key strengths

Deep LangChain & LangGraph integration for zero-config tracingEnd-to-end LLM observability with detailed trace visualizationBuilt-in evaluation and dataset management for regression testingPrompt management with versioning and A/B testing supportProduction monitoring with feedback collection and alerting

Free tier + paid plans

San Francisco, USA

Founded 2023

Self-hostable

Facts verified against smith.langchain.com on Oct 8, 2026

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LangSmith

LangSmith is an AI tool. No additional technical details — such as architecture, APIs, SDKs, or integrations — are available in the current fact sheet.

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