Unique vs. Total Opens and Clicks

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What is the difference between unique and totals opens? How about for clicks? In this article, we go over how to find these numbers as well as what they mean. 

9/20/21 Update: with the release of iOS 15, macOS Monterey, iPadOS 15, and WatchOS 8, Apple will change the way that we receive open rate data on your emails by prefetching our tracking pixel. With this change, it’s important to understand that open rates will be inflated.

It may be useful to look at the number of iOS-specific users within your data to understand how your rates may change.

For complete information on ways to potentially mitigate these Apple open changes, read this blog post: iOS 15: How to Prepare for Apple’s Changes.

View a Campaign's Opens and Clicks

The Campaigns tab shows you the open, click, and conversion data for each sent campaign. The numbers you see here are based on unique people opening, clicking, purchasing, etc.


When you click into an individual sent campaign, you will initially see the overview report for the campaign with high-level performance metrics displayed.

Unique Opens and Clicks

The core open and click data you see displayed in the middle section of this report represents unique opens and clicks — these numbers will match the numbers you see on the Campaigns tab front page.

Note that there are rare occurrences beyond Klaviyo’s control when some unique open events may not be tracked. For example, some third-party email clients and browser extensions block tracking pixels, including those that track email opens. These are the exception rather than the rule, but may impact open rates for some customers.


Total Opens and Clicks

At the bottom of this report, you'll see there is also data around Total Opens and Total Clicks.

These totals represent all opens and clicks recorded. For example, if one person received your campaign and opened twice, we would count two total opens. These totals will thus typically be higher than the unique counts.

If you see total open (or click) numbers that are significantly higher than unique opens (or clicks), this could signal that recipients are consistently forwarding your emails to others.

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