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LangSmith

Updated recentlyPricing may have changed — not yet verified

Evaluation, tracing and prompt management platform from the LangChain team.

by LangChain · Primary workflow: Systematic evaluation pipelines for LLM-powered features

not
scored

No verified editorial score yet. Scores appear only after documented evaluation.

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What it is

LangSmith provides dataset-backed evaluation runs, LLM tracing, annotation queues and prompt versioning for teams operationalizing LLM features. Works standalone from LangChain libraries via APIs/SDKs.

Editorial basis: vendor documentation and public information reviewed by our editors; written originally for this catalog. Hands-on testing has not yet been performed. Last editorial update 2026-08-26.

Editorial assessment

Best for
  • Product teams shipping LLM features needing regression evidence
  • RAG quality iteration loops
Not ideal for
  • Fully air-gapped evaluation requirements
  • Minimal budgets at high trace volume
Strengths
  • Tracing depth ties outputs to full execution context
  • Eval datasets create regression safety nets
Limitations
  • SaaS-centric; self-hosting limited
  • Costs track ingestion volume

Hands-on evidence

Vendor information reviewed; hands-on testing not yet completed.

Vendor information reviewed; hands-on testing not yet completed.

When we test this tool ourselves, this section will document the test date, exact scenario, setup experience, example output, integration result and discovered limitations — with reproducibility notes so you can replicate it.

Read our evidence policy →

Pricing

  • Developer (free)

    $0/moUnverified

  • Plus/Enterprise

    See vendorUnverified

Pricing reflects publicly listed information at research time and is marked unverified until an editor re-checks the vendor’s pricing page. Always confirm on the official site.

Integrations & compatibility

PythonTypeScriptGitHub Actions
Deployment
Cloud
Platforms
Web
Languages / SDKs
Python, TypeScript, JavaScript
API available
Yes
Learning curve
Moderate
Documentation quality
GOOD
Team fit
Small team, Mid-size, Enterprise
Support
See vendor

Security, privacy & AI transparency

AI features

Platform itself is AI-adjacent tooling; supports custom evaluators incl. LLM-as-judge with caveats documented.

Vendor response

Vendors can respond to listings and reviews through the vendor portal. Responses are moderated and labeled. No response has been received for this listing yet.