orchestrator
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 Eruo Fredoline·Last verified Oct 7, 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)

Runtime health

Operator-grade signals on how actively LangSmith is being maintained, how fresh its measurements are, and what failure classes operators have flagged. Every label below is anchored to a real date or count — we never infer maintainer activity we can't show.

Release cadence

Derived from the most recent editorial signal on this row.

Active
Updated Oct 7, 2026

6 days since last refresh · source: lastUpdated

Benchmark freshness

How recent the editorial measurements on this runtime are.

0editorial benchmarks

No editorial benchmarks for this runtime yet.

Community reproduction

Submissions that match an editorial measurement on similar hardware.

0reproduced reports

No community reproductions on file yet.

Get LangSmith

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

Frequently asked

Is LangSmith free?

Yes — LangSmith is free to use; some tiers or hosted options are paid.

What operating systems does LangSmith support?

LangSmith supports macOS, Linux, Windows.

Does LangSmith need a GPU?

No — LangSmith runs on CPU; it does not require or use a GPU.

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

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Before you buy

Verify LangSmith runs on your specific hardware before committing money.

Will it run on my hardware? →Custom hardware comparison →GPU recommender (4 questions) →