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

# Analyzing Domain Overlap

> How to interpret domain overlap metrics and assess cross-domain user stitching effectiveness

## Overview

The Domain Overlap view in Identity Insights shows user overlap across different domains within your organization, helping you assess how successful your identity framework is at stitching users across domains. This is important for cross-domain audience targeting and measurement.

<Info>
  **Prerequisites:**

  * Access to Identity Insights dashboard
  * Permutive deployed across multiple domains in your organization
  * Domain overlap is calculated once per month (on the 1st of each month)
</Info>

## Steps

<Steps>
  <Step title="Navigate to Domain Overlap tab">
    Go to **Identity > Identity Insights** and click the **Domain Overlap** tab.
  </Step>

  <Step title="Understand the metrics">
    The Domain Overlap view shows the percentage of users who appear on multiple domains within your organization. Higher overlap percentages indicate more successful cross-domain identity resolution.
  </Step>

  <Step title="Review domain pairs">
    Examine the overlap percentages between different domain pairs. This shows how well your identity solution is stitching users across specific domain combinations.
  </Step>

  <Step title="Assess stitching effectiveness">
    High domain overlap (e.g., 60%+) indicates strong cross-domain identity resolution, meaning users are successfully recognized across multiple domains. Low overlap may indicate gaps in your identity strategy.
  </Step>

  <Step title="Identify optimization opportunities">
    Use domain overlap data to identify:

    * Domains with strong cross-domain recognition
    * Domain pairs with low overlap that may need identity strategy improvements
    * Opportunities to improve cross-domain targeting and measurement
  </Step>

  <Step title="Review regularly">
    Review domain overlap data regularly to track changes in cross-domain identity resolution over time and measure the impact of any identity strategy improvements.
  </Step>
</Steps>

<Tip>
  **Tips for analyzing domain overlap:**

  * Higher overlap percentages indicate better cross-domain identity resolution, which improves targeting and measurement accuracy
  * Compare overlap across different domain pairs to identify which combinations have the strongest identity stitching
  * Use domain overlap data to validate the effectiveness of your cross-domain identity strategy
  * Low overlap may indicate the need for additional identifiers or identity resolution improvements
  * Domain overlap is particularly important for organizations with multiple properties or brands
</Tip>

<Warning>
  **Important:**

  * Domain overlap is calculated once per month on the 1st of each month - you cannot customize the date range
  * The view automatically refreshes with new data points at the beginning of each month
  * If you don't see updated data, wait until the 1st of the next month
  * Domain overlap requires Permutive to be deployed across multiple domains - single-domain organizations won't see meaningful overlap data
  * The calculation is based on query cost considerations, which is why custom date ranges aren't supported
</Warning>

<Note>
  **Note:**
  Domain overlap metrics help you understand cross-domain user stitching effectiveness, which is critical for accurate cross-domain audience targeting and measurement. Use this data to validate and optimize your identity resolution strategy.
</Note>

## Next Steps

<CardGroup cols={2}>
  <Card title="Understanding Identity Overlap" icon="chart-line" href="/guides/signals/identity/understanding-identity-overlap">
    Learn about identifier overlap analysis
  </Card>

  <Card title="Monitoring Data Ingestion" icon="chart-bar" href="/guides/signals/identity/monitoring-data-ingestion">
    Track daily data collection patterns
  </Card>

  <Card title="Back to Identity Insights" icon="arrow-left" href="/products/signals/identity/identity-insights">
    Return to Identity Insights overview
  </Card>
</CardGroup>