> ## Documentation Index
> Fetch the complete documentation index at: https://developer.notocat.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Learn how to use Notocat, the powerful Notion-to-newsletter tool. Discover API integration, contact syncing, and custom CSS for beautiful newsletters.

<img className="block dark:hidden" src="https://mintcdn.com/notocat/pbleOL1ROdR9kJQh/images/noto-working.png?fit=max&auto=format&n=pbleOL1ROdR9kJQh&q=85&s=2202b8400f8eaca49fd1e76d84d56449" alt="Hero Light" width={300} data-path="images/noto-working.png" />

<img className="hidden dark:block" src="https://mintcdn.com/notocat/pbleOL1ROdR9kJQh/images/noto-working.png?fit=max&auto=format&n=pbleOL1ROdR9kJQh&q=85&s=2202b8400f8eaca49fd1e76d84d56449" alt="Hero Dark" width={300} data-path="images/noto-working.png" />

## Get started here

<CardGroup cols={2}>
  <Card title="API Reference" icon="code" href="/api-reference/introduction">
    Learn about the Notocat API and how to sync contacts
  </Card>

  <Card title="Customize issues with CSS" icon="palette" href="/guides/custom-css">
    Learn how to customize the look and feel of your issues
  </Card>
</CardGroup>