Interest signals

Get your customers' attention with interest signals! An interest signal displays live click totals that update with every open. Your audience can see how many other recipients have checked out a product or promotion, encouraging them to join in on the fun

Create an interest signal

Interest signals are located in the Personalize section of the Litmus platform. Start from the Overview page of the Personalize tab to find the Interest signals templates. Or select the Interest signals link in the left menu where you can create a new widget or find any you've already created. Select New interest signal in the upper right corner.

Select a template. You can show your captured clicks in either a round badge or a rectangular bar over your background image.

Customize your interest signal

Change the colors and fonts for your interest signal to mesh seamlessly with your signal background.


  • Click-through URL
    • include the full destination URL for your image
  • Upload background image
    • jpg, gif, png, bmp formats allowed; built-in image cropper allows adjustments
  • Layout
    • select placement of badge or bar on your image
    • switch to a different version (badge or bar) easily from here!
  • Image size
    • select the overall image size
  • Display threshold (optional)
    • include a minimum number of clicks that must be captured to show the interest badge in recipients' email

interest tracker configure menu pane Enlarge Configure menu image


interest tracker style options pane Enlarge Style menu image

  • Counter background
    • select or enter a background color for the counter
  • Digit font styling
    • select font family, size and color for the counter
  • Digits color
    • select font color for interest count number
  • Counter text
    • enter your message for the interest signal
  • Counter font styling
    • select font family, size, and color for the message text

Select the green Next: Preview your interest signal button in the upper right corner when you are finished with your customizations. If you included a display threshold, you'll see that noted at the top of the test pane. Test the look by entering any numbers into the test field to see the layout from below or above your threshold. These tests do not affect your code!


If you want to make any changes, choose the Back to editing button. If you're satisfied with the interest signal, select Next: Save and get HTML in the upper right corner.

Your tag code will be generated!

You can copy the tag using the Copy HTML button below the code box.

You can also copy a replacement code to capture clicks for the same tracked URL anywhere else in your email.

Your new item will appear in the Interest signals library in your account so if you don't need the code right away, you can copy it from there later.

NOTE: The replacement code for URLs in your email is not included with HTML copied from your library. However, you can use the https://click.XXXXX portion of the copied tag code.

interest tracker code generated for downloading Enlarge tracker code image

NOTE: Looking for more customization options? Reach out to discuss how Litmus Personalize Pro can help!

Add an interest signal to your email

To add an interest signal to your email, copy the code generated and add it to your email's HTML. You can quickly copy the tag by hovering over the sentiment tracker's thumbnail and selecting Copy HTML. Add the code in Litmus Builder or anywhere you develop your emails!

Any interest signal that is in development with show a Draft badge in the upper right corner of its thumbnail. Draft signals do not have HTML available to copy and can still be edited.

animation of hovering over interest signals library widgets and selecting copy html button

View your interest signal click data

Enlarge View report image


Hover over a thumbnail in the Interest signals section of the Personalize tab and select View report to see click data for your interest signal.

The report will display the total number of clicks your interest signal has recorded, regardless of the link source (your interest signal image or the replacement link in your email content).

NOTE: Your report thumbnail reflects your click threshold so the badge or bar will not appear on it if your clicks are below that setting.

Interest signal report showing thumbnail of image, total clicks, and link

Impression usage

An interest tracker uses one image and you can include multiple interest signals in any email. Each individual interest signal appearing in your email will use one impression for each open.

NOTE: Impressions usage limits vary based on your subscription. Learn more about usage limits and how impressions are counted to make sure you understand how your tag will impact your usage!

Apple Mail Privacy Protection (MPP)

When an email is sent to an inbox with MPP enabled, email images are automatically downloaded and cached. The cached images are then displayed when the email is opened. Due to this, interest signals will display the counts as they were at the time of your send for users with MPP enabled.

We recommend staggering your sends when using interest signals. This will allow a click count to be gathered before the images are cached for segments of your subscribers. MPP-impacted opens count towards impression usage.


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