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

# Track usage of a card

> See which sources a card is built on, and which segments and destinations depend on it.

Every card page shows what it depends on and what depends on it, so you can tell what a change will affect before you make it.

<img src="https://mintcdn.com/occtoo/NueWsyO-lsrXKror/images/guides/studio/cards/card-usage-widgets.png?fit=max&auto=format&n=NueWsyO-lsrXKror&q=85&s=8e61b95a769354ce10a6f1a7f89fb17c" alt="Card details, segments and destinations widgets" width="1344" height="372" data-path="images/guides/studio/cards/card-usage-widgets.png" />

## What the card is built on

**Card details** lists the data sources under **Based on**. Each is a link to the source page.

## Segments using this card

**Segments using this card** lists every segment built on the card, with its entry count. Each name links to the segment.

## Destinations using this card

**Destinations using this card** lists the destinations that include the card, with the endpoint **Version** and whether it is **Published** or **Not published**.

<Info>
  The **Used by** counts in the page header and the counts in the widget titles
  can differ: the header counts endpoint versions, while the widget counts
  distinct destinations.
</Info>

<Warning>
  Anything listed here is affected when you activate a change to the card,
  archive it or remove one of its properties. Check these widgets first.
</Warning>