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

# Visitors: Unique Site Visitors

> Track unique visitors to your Shopify store. Measure website traffic and audience reach with deduplicated visitor counts from Upstack Pixel.

<Tip>
  Visitors measures the count of unique individuals who visited your website during the selected time period.
</Tip>

## Formula

<Info>
  **Unique Visitors** = **COUNT** ( distinct visitor\_id )
</Info>

### Formula Components

| Metric          | Definition                                                       |
| --------------- | ---------------------------------------------------------------- |
| **visitor\_id** | Unique identifier assigned to each visitor via the Upstack Pixel |

| Metadata        |                         |
| --------------- | ----------------------- |
| **Type**        | Number                  |
| **Data Source** | [Upstack Pixel](/pixel) |
| **Aggregation** | Count (Distinct)        |

***

## Example

Your Shopify store had **12,847 unique visitors** in January.

| Week   | Visitors | Sessions | Pages/Visitor |
| ------ | -------- | -------- | ------------- |
| Week 1 | 3,124    | 4,892    | 3.2           |
| Week 2 | 3,456    | 5,234    | 2.9           |
| Week 3 | 2,987    | 4,567    | 3.1           |
| Week 4 | 3,280    | 5,012    | 3.4           |

***

## How It Works

Upstack assigns each visitor a unique identifier on their first visit. Subsequent visits from the same browser are deduplicated, giving you an accurate count of distinct people reaching your site. Cross-device visitors may be counted separately unless identity resolution links their sessions.

***

## When to Use

| Scenario                    | Action                                                      |
| --------------------------- | ----------------------------------------------------------- |
| Measuring campaign reach    | Compare visitors before and after campaign launch           |
| Analyzing traffic trends    | Track visitor growth week-over-week or month-over-month     |
| Calculating conversion rate | Divide conversions by visitors for top-of-funnel efficiency |
| Benchmarking audience size  | Compare visitor counts across time periods or channels      |

***

## Related Metrics

| Metric                                                                           | Relationship                            |
| -------------------------------------------------------------------------------- | --------------------------------------- |
| [Sessions](/reference/metrics/funnel/awareness/sessions)                         | Each visitor may have multiple sessions |
| [New Visitors](/reference/metrics/funnel/awareness/new-visitors)                 | Subset of visitors who are first-time   |
| [Page Views](/reference/metrics/funnel/awareness/page-views)                     | Total pages viewed by all visitors      |
| [Revenue per Visitor](/reference/metrics/funnel/conversions/revenue-per-visitor) | Revenue divided by visitor count        |

[See all Awareness metrics →](/reference/metrics/funnel/awareness)