> ## Documentation Index
> Fetch the complete documentation index at: https://langchain-5e9cc07a-preview-opensw-1781706951-9d0138e.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Set up LangSmith

This section covers how to host and manage LangSmith infrastructure for [observability](/langsmith/observability), [evaluation](/langsmith/evaluation), and [prompt engineering](/langsmith/prompt-engineering).

## Choose how to set up LangSmith

You can deploy LangSmith in one of two modes:

* [**Cloud**](/langsmith/cloud): fully managed by LangChain
* [**Self-hosted**](/langsmith/self-hosted): you manage the full stack within your infrastructure

<Callout>
  The self-hosted deployment option is available on the Enterprise plan. [Get a demo](https://www.langchain.com/contact-sales) to learn more.
</Callout>

<Columns cols={2}>
  <Card title="Cloud" icon="cloud" iconType="solid" href="/langsmith/cloud" cta="Get started">
    Fully managed observability, evaluation, and prompt engineering.
  </Card>

  <Card title="Self-hosted" icon="server" iconType="solid" href="/langsmith/self-hosted" cta="Run self-hosted">
    **(Enterprise)** Full control with observability, evaluation, and prompt engineering in your infrastructure.
  </Card>
</Columns>

### Comparison

Refer to the following table for a comparison:

| Feature                                          | **Cloud**                           | **Self-Hosted**                           |
| ------------------------------------------------ | ----------------------------------- | ----------------------------------------- |
| **Infrastructure location**                      | LangChain's cloud                   | Your infrastructure                       |
| **Who manages updates**                          | LangChain                           | You                                       |
| **Can deploy agents?**                           | ✅ Yes                               | ✅ Yes (with LangSmith Deployment enabled) |
| **Observability data location**                  | LangChain cloud                     | Your infrastructure                       |
| **[Pricing](https://www.langchain.com/pricing)** | Plus tier                           | Enterprise                                |
| **Best for**                                     | Quick setup, managed infrastructure | Full control, data isolation              |

### Related

* [Plans and Pricing](https://www.langchain.com/pricing)
* [Observability](/langsmith/observability)

***

<div className="source-links">
  <Callout icon="terminal-2">
    [Connect these docs](/use-these-docs) to Claude, VSCode, and more via MCP for real-time answers.
  </Callout>

  <Callout icon="edit">
    [Edit this page on GitHub](https://github.com/langchain-ai/docs/edit/main/src/langsmith/platform-setup.mdx) or [file an issue](https://github.com/langchain-ai/docs/issues/new/choose).
  </Callout>
</div>