> ## 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.

# What is Datalyr?

> See which marketing brings you customers and revenue.

Datalyr brings your customer activity, revenue, and ad spend together.

Use it to see where customers came from, what they did before converting, and which marketing created revenue.

## Start with your setup

<CardGroup cols={2}>
  <Card title="Website" icon="browser" href="/getting-started/install-web-tracking">
    Add Datalyr to a website or web app.
  </Card>

  <Card title="Shopify" icon="store" href="/use-cases/shopify">
    Connect your store, orders, and marketing.
  </Card>

  <Card title="Mobile app" icon="mobile" href="/use-cases/mobile">
    Track installs, activity, subscriptions, and campaigns.
  </Card>

  <Card title="SaaS with Stripe" icon="credit-card" href="/use-cases/stripe">
    Connect website activity to subscriptions and revenue.
  </Card>
</CardGroup>

## How the pieces fit together

1. **Track customer activity.** Add Datalyr to your website or app.
2. **Connect revenue.** Add the source where customers pay you.
3. **Connect ad platforms.** Bring in spend and campaign data.
4. **Verify the data.** Confirm that visits, conversions, and revenue appear correctly.

<Note>
  You do not need to connect everything at once. Start with customer activity and revenue, verify both, then add ad platforms.
</Note>