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LangSmith

https://smith.langchain.com Research Team Data
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LangChain’s commercial platform for agent/LLM evaluation, tracing, prompt management, monitoring, annotation and deployment workflows.

LangSmith supports tracing, online/offline evaluations, prompt hub/playground, annotation queues, monitoring/alerting, agent deployment and agent-engineering workflows. It is part of LangChain’s broader agent engineering platform rather than a standalone company.

Positioning

LLM evaluation and observability platform for agent engineering

Key facts

HQ location
San Francisco, CA, USA
Founded
2023
Employee range
— (See LangChain)
Funding stage
Series B
Company type
Private (Product of LangChain (Private))
Pricing model
Subscription Usage Based (Usage-based SaaS plans: Developer, Plus, Enterprise; pay-as-you-go traces/evals/features)
Last updated
Jun 21, 2026

Revenue estimate

Unknown / not publicly disclosed

Valuation estimate

See LangChain

Investments

See LangChain; LangChain announced $125M Series B at $1.25B valuation in Oct 2025

Target customers

AI engineers, LLM product teams and enterprises building reliable agents

Key competitors

Humanloop, Galileo, Langfuse, Braintrust, Arize AI, Vellum

Known customers

Replit, Clay, Harvey, Vanta, Cloudflare, Rippling, Cisco, Workday

Classification (raw research text)

Core focus
LLM evaluation and monitoring
Core industry
Enterprise AI Development
Core category
LLM developer tooling

Shown verbatim from the research spreadsheet — deriving structured segment/industry tags from this text is a future phase.

Attribute breakdown

  • AI Workflows Secondary feature
  • Agent Builder / Agent Configuration Secondary feature
  • Multi-agent Orchestration / Runtime Secondary feature
  • System / API Integration Secondary feature
  • Prompt Management / Prompt Engineering Primary focus
  • Retrieval-Augmented Generation Secondary feature
  • AI / LLM Data Pipeline Secondary feature
  • Model Deployment / Inference Infrastructure Secondary feature
  • AI Quality Assurance / LLM Evaluation Primary focus
  • AI Observability / Monitoring Primary focus
  • AI Security / Guardrails Secondary feature
  • AI Governance / Policy Management Secondary feature
  • AI Risk / Compliance Secondary feature
  • AI Asset Inventory / Model Registry Secondary feature
  • Human-in-the-Loop Review / Feedback Primary focus
  • Analytics / BI / Decision Intelligence Secondary feature
  • Enterprise App / Internal Tool Builder Secondary feature
Show all 32 attributes
  • AI Workflows Secondary feature
  • AI Automation / Business Process Automation Not emphasized
  • AI Fine-tuning / Custom Model Training Not emphasized
  • Agent Builder / Agent Configuration Secondary feature
  • Multi-agent Orchestration / Runtime Secondary feature
  • System / API Integration Secondary feature
  • Prompt Management / Prompt Engineering Primary focus
  • Retrieval-Augmented Generation Secondary feature
  • Graph RAG / Knowledge Graph Retrieval Not emphasized
  • Enterprise Search / Knowledge Management Not emphasized
  • AI / LLM Data Pipeline Secondary feature
  • Document AI / Document Processing Not emphasized
  • Model Deployment / Inference Infrastructure Secondary feature
  • Traditional Machine Learning Not emphasized
  • AI Quality Assurance / LLM Evaluation Primary focus
  • AI Observability / Monitoring Primary focus
  • AI Security / Guardrails Secondary feature
  • Data Privacy / PII / Confidential AI Not emphasized
  • AI Governance / Policy Management Secondary feature
  • AI Risk / Compliance Secondary feature
  • AI Asset Inventory / Model Registry Secondary feature
  • Human-in-the-Loop Review / Feedback Primary focus
  • Call Transcription / Speech-to-Text Data Capture Not emphasized
  • Conversation Intelligence / Speech Analytics Not emphasized
  • Text Chatbots / Conversational Assistants Not emphasized
  • Voice AI Agents Not emphasized
  • Voice Infrastructure / STT / TTS Not emphasized
  • AI for Customer Experience / Support Automation Not emphasized
  • Sales / Revenue Intelligence Not emphasized
  • Analytics / BI / Decision Intelligence Secondary feature
  • Enterprise App / Internal Tool Builder Secondary feature
  • Vertical-Specific AI Not emphasized