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

# Overview

Sim APIs are a dedicated, high-performance suite of developer-focused APIs by Dune, designed for building realtime, multichain apps with exceptional developer experience. Sim APIs offer fast and reliable access to EVM and SVM blockchain data.

<CardGroup cols={2}>
  <Card title="Visit Sim Website" icon="globe" href="https://sim.dune.com">
    Explore the official Sim website to learn more about its features, capabilities, and how it can power your apps.
  </Card>

  <Card title="View Sim Docs" icon="book" href="https://docs.sim.dune.com">
    Dive into the comprehensive Sim API docs, including quickstarts, detailed API references, and guides.
  </Card>
</CardGroup>

<Note>
  **Sim APIs are an upgraded version of what was previously known as Dune Echo.** They offer improved performance and a broader set of features for developers.
</Note>