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LangSmith

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LangChain's observability platform

Free tier | $39/seat/moObservabilityLast verified: 2026-01-18

Overview

LangSmith for debugging and monitoring LLM apps. Tight LangChain integration.

Works with

LangChainPythonJavaScriptAny LLM

Pricing

MOST POPULAR
$0/seatDeveloper
  • 1 seat
  • 5,000 base traces/month included
  • $0.50 per 1K base traces (14-day retention)
  • $5.00 per 1K extended traces (400-day retention)
  • Tracing and debugging
  • Online and offline evals
  • Prompt Hub and Playground
  • Monitoring and alerting
  • Annotation queues
  • 1 Agent Builder agent
  • 50 Agent Builder runs/month
  • Community Slack support
  • Google/GitHub SSO
$39/seat/moPlus
  • Up to 10 seats
  • 10,000 base traces/month included
  • $0.50 per 1K base traces (14-day retention)
  • $5.00 per 1K extended traces (400-day retention)
  • 1 free Dev deployment with unlimited runs
  • Additional deployments: $0.005/run
  • Dev uptime: $0.0007/min
  • Prod uptime: $0.0036/min
  • Unlimited Agent Builder agents
  • 500 Agent Builder runs/month
  • $0.05 per additional Agent Builder run
  • Up to 3 workspaces
  • Email support
  • Organization roles (User and Admin)
CustomEnterprise
  • Custom seats and workspaces
  • Custom trace volume
  • Cloud, Hybrid, or Self-hosted deployment
  • Hybrid: SaaS control plane + self-hosted data
  • Self-hosted: data never leaves your VPC
  • Custom SSO and RBAC
  • Custom Agent Builder packages
  • Team trainings
  • Architectural guidance
  • Access to deployed engineers
  • Support SLA
  • Annual invoicing
  • Custom terms and infosec review

Pros

  • +Deep LangChain integration
  • +Strong evaluation
  • +Prompt playground
  • +Agent Builder (no-code)
  • +1-click deployment for LangGraph agents
  • +Framework-agnostic tracing

Cons

  • -Best with LangChain
  • -Can get expensive at scale
  • -Deployment only on Plus+

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