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freemium (paid for team / enterprise)

LangSmith

LangChain's observability + evaluation platform. Trace agent runs, run evaluators against benchmark suites, version prompts. The dominant trace+eval tool for the LangChain/LangGraph ecosystem.

By Fredoline Eruo·Last verified May 6, 2026

Overview

LangChain's observability + evaluation platform. Trace agent runs, run evaluators against benchmark suites, version prompts. The dominant trace+eval tool for the LangChain/LangGraph ecosystem.

Stack & relationships

How LangSmith relates to other entries in the catalog — recommended pairings, alternatives, dependencies, and edges to avoid. Each edge carries a one-line operator note from our editorial team.

LangSmith ↔ ecosystem

Alternatives

  • Alternative to
    Phoenix (Arize AI)

    Phoenix is OSS (Apache 2.0) with OpenInference traces; LangSmith is closed-source with deeper LangChain integration. Pick Phoenix for vendor-independence.

  • Alternative to
    Phoenix (Arize AI)

    LangSmith for the LangChain-native path; Phoenix for the OSS/OpenInference path. Pick by ecosystem fit and self-hosting requirement.

Pros

  • Deep LangChain integration
  • Strong eval harness for agent workloads
  • Prompt regression testing

Cons

  • Closed-source
  • Best fit when already on LangChain
  • Self-hosted is enterprise-tier only

Compatibility

Operating systems
macOS
Linux
Windows
GPU backends
n/a
LicenseClosed source · freemium (paid for team / enterprise)

Get LangSmith

Official site
https://www.langchain.com/langsmith

Frequently asked

Is LangSmith free?

LangSmith has a paid tier (freemium (paid for team / enterprise)). Check the pricing page for current terms.

What operating systems does LangSmith support?

LangSmith supports macOS, Linux, Windows.

Which GPUs work with LangSmith?

LangSmith supports n/a. CPU-only inference is also possible but slow.

Reviewed by RunLocalAI Editorial. See our editorial policy for how we evaluate tools.