# LangChain

LangSmith is an agent engineering platform for building, testing, deploying, monitoring and governing AI agents. It includes tracing, evaluations, a managed deployment service, the Fleet agent builder, the Engine issue-detection agent, sandboxes and an LLM gateway. LangChain also maintains open source frameworks, including LangGraph and Deep Agents, for building agents with any model provider.

Page: https://slateindex.ai/brand/langchain · data of 2026-11-03

## Facts

- Founded: 2023
- Headquarters: San Francisco, CA, United States
- Employees: 201–500
- Company type: Private, venture-backed
- Latest funding: Series B, led by IVP
- Deployment: Cloud (SaaS), hybrid (SaaS control plane with self-hosted data plane), or self-hosted in the customer's VPC
- Best for: Teams building agents that need control over models, context, memory and deployment, and the ability to test, govern and improve them in production

## Products

- LangSmith: Platform for tracing, evaluating, deploying and monitoring agents.
- LangSmith Fleet: No-code builder for creating agents from everyday language, formerly Agent Builder.
- LangSmith Engine: Agent that detects production failures, diagnoses root causes and proposes fixes.
- LangSmith Sandboxes: Isolated environments for running agent-generated code.
- LangSmith LLM Gateway: Controls model calls, spend and sensitive data between agents and model providers.
- LangGraph: Open source framework for building agents with low-level control.
- LangChain: Open source framework for building agents quickly with templates and any model provider.
- Deep Agents: Open source agent harness for autonomous, long-running tasks.

## Rankings

| Category | Rank | Visibility | Mentions |
|---|---|---|---|
| AI Agents | 12 of 80 | 10.4 | 18 |

## By engine

| Engine | Visibility | Mention rate |
|---|---|---|
| chatgpt | 12.6 | 33.3% |
| google_ai_mode | 13.3 | 22.2% |
| perplexity | 5.2 | 11.1% |

## Definitions

- Visibility (0–100): how often and how high AI answers name the brand, weighted by position.
- Mention rate: share of collected AI answers that name the brand.
- Share of voice: the brand's mentions as a share of all brand mentions in the category.
- Citation authority: share of answers naming the brand that cite the brand's own site.

Cite as: SlateIndex, “LangChain AI visibility profile”, https://slateindex.ai/brand/langchain, data of 2026-11-03. Licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).