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LangSmith

Platform

by LangChain

Traces, evaluates and monitors language-model applications in development and production.

Find alternatives to LangSmith

Named free tier, a paid ladder, pay-as-you-go usage and a contact-sales tier on the shared LangChain pricing page.

What it does

• Evaluation and observability

How it compares

• Braintrust

  Compare LangSmith and Braintrust to see how a complete agent engineering platform differs from an evaluation-focused tool.

  Official documentation · 19 Sep 2026
• Langfuse

  This guide outlines the key differences between Langfuse and LangSmith ... Choose LangSmith if you are an all-in LangChain/LangGraph shop that wants a managed SaaS ... Is Langfuse the best LangSmith alternative? Yes, if you want an independent open-source platform

  Official documentation · 19 Sep 2026

Sources

Pricing

Pricing page · 22 Aug 2026

Named free tier, a paid ladder, pay-as-you-go usage and a contact-sales tier on the shared LangChain pricing page.

Sold within

Pricing page · 29 Sep 2026

The pricing page is LangSmith's own plan ladder, with self-serve Developer ($0, "Start for free") and Plus plans and a contact-sales Enterprise tier: "$39 / seat per month then pay as you go".

Also from LangChain

• LangChain Developer tool

  Open-source framework for composing language-model calls, tools and retrieval into applications.

• LangGraph Developer tool

  Open-source library for building agents as explicit graphs of steps and state.

• LangSmith Context Hub Agent platform

  Versions and deploys prompts and agent context. Part of the LangSmith platform (categorized under 'No-Code Agents', 'Observability', 'Evaluation' or 'Deployment infrastructure' depending on the module).

• LangSmith Deployment Agent platform

  Deploys and operates production agents. Part of the LangSmith platform (categorized under 'No-Code Agents', 'Observability', 'Evaluation' or 'Deployment infrastructure' depending on the module).

• LangSmith Engine Agent platform

  Analyzes agent traces and recommends fixes. Part of the LangSmith platform (categorized under 'No-Code Agents', 'Observability', 'Evaluation' or 'Deployment infrastructure' depending on the module).

• LangSmith Fleet Agent platform

  No-code agent building, deployment into Slack/Teams/Gmail, and human-in-the-loop approval controls. Part of the LangSmith platform (categorized under 'No-Code Agents', 'Observability', 'Evaluation' or 'Deployment infrastructure' depending on the module).

• LangSmith LLM Gateway Agent platform

  Governs model calls and spending across providers. Part of the LangSmith platform (categorized under 'No-Code Agents', 'Observability', 'Evaluation' or 'Deployment infrastructure' depending on the module).

• LangSmith Sandboxes Agent platform

  Runs agent-generated code in isolated virtual machines. Part of the LangSmith platform (categorized under 'No-Code Agents', 'Observability', 'Evaluation' or 'Deployment infrastructure' depending on the module).

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