What does LangSmith do?

LangSmith enables teams to evaluate and improve the quality and reliability of LLMs and AI agents. It is catalogued under LLM eval & observability on PulseGate.

Who is LangSmith for?

LangSmith is a B2B product built for AI engineers and QA teams.

What platforms does LangSmith run on?

LangSmith runs on the web and API.

Is LangSmith still maintained?

Unverified. LangSmith has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What are alternatives to LangSmith?

Similar projects tracked by PulseGate include LangSmith, LangSmith, and Fleet.

LangSmith is developed by LangChain.

When did LangSmith launch?

LangSmith first shipped in 2024.

Does LangSmith have an API or integrations?

Yes — LangSmith exposes a public API.

Back to the index

LangSmith

Name: LangSmith
Author: LangChain

langchain.comLLM eval & observability

LangSmith Evaluations is a platform for testing, monitoring, and debugging the performance of large language models and AI agents. It supports prompt optimization, regression detection, and human feedback workflows, helping teams ensure high-quality AI deployments.

WebCloud-managedAPI

Visit langchain.com

2alternatives

5features

2024since

Overview

5 features

LangSmith sits in PulseGate's LLM eval & observability category. It enables teams to evaluate and improve the quality and reliability of LLMs and AI agents. LangSmith is a B2B product aimed at AI engineers and QA teams. LangSmith is available on the web and API.

It is developed by LangChain, and it first shipped in 2024. Key capabilities include prompt testing, quality monitoring, and failure debugging. It exposes integrations via a public API.

Summary written by a language model from the project’s public pages.

Prompt testing
Quality monitoring
Failure debugging
Regression detection
Human feedback

Built with & integrations

Hosting

Cloudflare

AI providers

multiple

Connectors

API

Runs on

BrowserCloud-managedAPI-only

Detected from

multiple: bLangChain in the HTML
Cloudflare: cf-ray header · cf-cache-status header

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of Service

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed26 Jun · 19:15 UTC
Listing verified against its public source
Source: PulseGate · Open

Frequently asked questions about LangSmith

What does LangSmith do?: LangSmith enables teams to evaluate and improve the quality and reliability of LLMs and AI agents. It is catalogued under LLM eval & observability on PulseGate.
Who is LangSmith for?: LangSmith is a B2B product built for AI engineers and QA teams.
What platforms does LangSmith run on?: LangSmith runs on the web and API.
Is LangSmith still maintained?: Unverified. LangSmith has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What are alternatives to LangSmith?: Similar projects tracked by PulseGate include LangSmith, LangSmith, and Fleet.LangSmith LangSmith Fleet
Who makes LangSmith?: LangSmith is developed by LangChain.
When did LangSmith launch?: LangSmith first shipped in 2024.
Does LangSmith have an API or integrations?: Yes — LangSmith exposes a public API.

At a glance

Pricing: Freemium · pricing page detected
Platforms: Web
Languages: English
Built for: AI engineers and QA teams
Model: B2B
Solves: Enables teams to evaluate and improve the quality and reliability of LLMs and AI agents.

Developer

LangChain

Index record

Identity confidence: Medium · 72.8
Indexed: 26 Jun 2026
Lifecycle: Alive
Last seen: 26 Jun 2026

Identity audit (12)

Slug: langsmith-llm-ai-agent-evals-platform-continuously-impro-langchain-com
Lifecycle last checked: 8 Aug 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 26 Jun 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Canonical URL: https://langchain.com/langsmith/evaluation

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