Guide to Mobile Popups

Who gets this? Shops on all Postscript plans have access to these features. Learn more about Postscript Plans.

Postscript popups are a compliant and powerful way to convert site visitors to SMS subscribers so you can nurture them with a personalized SMS program throughout the customer lifecycle. By employing a Postscript popup, you can:

  • Increase your Acquisition Rate, which in turn, improves your overall Subscriber Lifetime Value and total value of your SMS program.
  • Optimize your popup conversions by finding the best combination of popup creatives, timing, images, message copy, and incentives for your brand all through A/B testing.
  • Power a more personalized SMS experience for all subscribers by capturing subscriber data in Postscript popups.

In this article, we discuss compliance requirements of popup collection, guide you through how to create a mobile popup, walk you through how to collect custom properties with Postscript popups, and then show you how to A/B test and schedule multiple popups.

Compliance Requirements

There are a few key elements that roll into popup compliance requirements including properly displaying TCPA disclaimer language, ensuring accessibility, employing confirmed opt-in, and collecting email and phone on two separate steps. We'll dive deeper into each in the tab system below.

Disclaimer Language Opt-in Methods Two Step Collection

Compliance is a priority at Postscript so our popups automatically include the following TCPA disclaimer language with your Terms of Service and Privacy Policy hyperlinked:

*By providing your phone number, you agree to receive recurring automated marketing text messages (e.g. cart reminders) from this shop and third parties acting on its behalf. Consent is not a condition to obtain goods or services. Msg & data rates may apply. Msg frequency varies. Reply HELP for help and STOP to cancel. You also agree to the Terms of Service and Privacy Policy.

With Postscript popups, you can use our built-in toolkit or CSS to adjust the look and feel of your popup and match your branding.

Because you can adjust even the text color of the TCPA disclaimer language with CSS, we highly encourage you to ensure that the contrast between the font color and background color is up to ADA standards so you can provide a widely inclusive experience for site visitors and avoid losing valuable subscribers and customers due to inaccessibility.

Create a Mobile Popup

To begin crafting your mobile popup, select Acquisition on the left-side navigation panel. Next, select Create in the upper-right corner of the page, then select Mobile from the drop-down options.


  • Name. Choose a name that allows you to easily identify this popup from the list of available popups on your main Popups page.
  • Phone Collection Step. In the phone collection step and the custom step cards, you can adjust the copy for your pre-headline, headline, post-headline, button, and close button.
  • + Add Step/Custom Step. When you select + Add Step, you are able to add an additional step for a subscriber to enter their email address. You can also use this second step to collect custom properties.
  • Form. This section is where you will configure your custom property collection for all steps. We discuss this in more depth below.
  • Popup settings. In the Popup settings card, you are able to adjust the style and behavior of your popup for all steps. We'll discuss both in the tab system below:
Style Behavior


  • Popup type: Select if you'd like to display a partial window or full screen popup.
  • Logo image. Upload a logo image by selecting a file from your device. You can also drag and drop the image file into the upload field.
  • Background style. Choose to have your popup background be a solid color or an image.
    • Background color. If you select a solid color background, you can enter a specific hex code for your desired color.
    • Background image. If you select a background image, you can upload the image or GIF from your device or drag and drop the file into the upload field. The recommended dimensions of a mobile popup background image are 350 x 600 px and less than 500 KB for optimal sizing and resolution.
  • Font. Select your preferred font. This font applies to all text on your mobile popup.
  • Corner style. Choose whether your mobile popup will have square or rounded corners.
    • Corner roundness. If you selected rounded corners, then use this field to set how round the corners should appear.
  • Primary text color. Set your primary text color by entering a hex color code. This color applies to all text on your mobile popup except button text.
  • Button color. Set the color of your subscribe button by entering a hex color code.
  • Button text color. Set the color of your subscribe button text by entering a hex color code.
  • Button style. Choose whether your CTA button will have square or rounded corners.
  • Headline font size. Adjust the size of your main headline font. The headline is 10% OFF in the example above.
  • Post-headline font size. Adjust the size of your post-headline font. The post-headline is ON YOUR ORDER in the example above.

Collect Custom Properties

Under the Form card within the popup editor, you can customize the questions for your popup. Subscriber responses will be saved as custom properties within a subscriber profile.


  1. Your opt-in method is Onsite Opt-in.
    • With Onsite Opt-in, you will see a Welcome message. You can craft the message your subscribers will receive once they opt into your SMS program via mobile popup. You can customize this message with photos, gifs, merge tags, coupons, discount links, product links, or a contact card.
  2. Select Add Question to add a question to your popup. Choose if you'd like subscribers to answer this question via freeform text or multiple choice. Their response will be added to their subscriber profile under Custom Properties.
  3. Within the Text question or Multiple choice question field, craft your question copy (for example: what's your main skin concern?). 
    • If adding a multiple choice option, be sure to add the options. You can add up to four.
  4. Under Subscriber property, add the property name you are collecting by either creating a new property or selecting an existing property. You can think of the subscriber property as the main subject of the question (for example: if you ask subscribers what their main skin concern is, the subscriber property would be "skin_concern").
   Interested in forwarding custom properties to profiles in Klaviyo? Learn how here!

A/B Test Your Popups

Note: Shops on Postscript's Professional and above have access to A/B testing popups. Learn more about Postscript Plans.


  1. Select Acquisition in the side menu of your Postscript dashboard.
  2. Select Create in the upper right corner, then select A/B Test.
  3. Select if you'd like to test your mobile or desktop popups. Then select Create Test.
  4. Name the A/B test. Choose a name that will allow you to easily identify and track this test in the future.
  5. Under Choose popups, select the variants you'd like to test. You'll need to choose at least two variants and each popup variant must be activated in order to be added to an A/B test.
  6. If you'd like to select more than two popups, select the + Add Variant button below Variant 2.
  7. Set the distributions for each variant by entering a percentage into the Distribution field next to each select variant. Remember, the distribution of all variants must equal 100%.
  8. Under Pages, indicate which pages of your site you'd like the popups to be included and excluded on (note: Updating these included and excluded pages on this step will update the original popups as well).
  9. Under Ending the test, select Run until the test is stopped manually. You can end this test at any time.
  10. Once you've selected the popups you'd like to test and added the website pages you'd like to include and exclude the popups on, you can start your test by selecting Start Test in the upper right corner.

Schedule Popups to Activate or Deactivate


  1. Select Acquisition in the side menu of your Postscript dashboard.
  2. Locate the popup you would like to schedule and select the Actions dropdown on the right side of the page.
  3. Select Schedule or Edit Schedule (note: If there is not an existing scheduled event for a popup, the link will say Schedule. If there is an existing event, the link will say Edit Schedule).
  4. Set a time to Enable popup or Disable popup this popup.
    • By choosing Enable Popup, you are choosing to show the popup on a specific date at a specific time.
    • By choosing Disable Popup, you are choosing to remove the popup from showing on a specific date at a specific time.
  5. Select the Schedule button to schedule your popup and save your changes.
   Note: When the popup is scheduled to deactivate, if multiple popups are activated, visitors will see the most recently edited popup.

Additional Resources

Get Support

Have questions? Please feel free to reach out to our wonderful Support team at or via live chat. You can also submit a support request here!

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