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

# SDK Reference

> Add Datalyr to your website, server, or mobile app.

Choose the SDK that matches where your code runs.

| SDK                   | Current version |
| --------------------- | --------------- |
| Web                   | `1.7.6`         |
| Node.js               | `1.3.1`         |
| iOS                   | `2.1.8`         |
| React Native and Expo | `1.7.13`        |

<CardGroup cols={2}>
  <Card title="Web" icon="browser" href="/sdk-reference/web">
    Track website activity, identity, and attribution in the browser.
  </Card>

  <Card title="Node.js" icon="server" href="/sdk-reference/node">
    Track trusted events from your backend.
  </Card>

  <Card title="iOS" icon="apple" href="/sdk-reference/ios">
    Track app activity and attribution in a native iOS app.
  </Card>

  <Card title="React Native" icon="mobile" href="/sdk-reference/react-native">
    Track mobile apps built with React Native or Expo.
  </Card>
</CardGroup>

<Note>
  Use one SDK for each runtime. For example, use the Web SDK in the browser and the Node.js SDK on your server.
</Note>