Onsite Opt-In is Here—and it’s the Key to Unlocking SMS List Growth
News, List Growth

Laura Serino

December 14, 2023

Reading Time: 3 minutes

Acquiring new subscribers is the key to maintaining a healthy, robust SMS marketing list. But innovation in this space has been at a standstill. Most merchants use pop-ups that send subscribers down one of these journeys: reply “Y” to confirm your subscription, two-touch that takes the user off-site and into their messaging app or the single opt-in (which is not compliant.)

These experiences all lead to added steps that can limit list growth potential—losing an opt-in along the way because the journey is clunky or takes them off site. 

Onsite Opt-in is a patent-pending feature that solves this by creating a seamless and compliant experience for the user.

Here’s how it works.

A popup appears and a subscriber can autofill their phone number. 

They tap submit to subscribe.

The visitor is sent a one-time passcode via text.

The visitor enters the code, leveraging autofill.

Onsite Optin - How It Works


They tap submit and they’re subscribed. Ta-da! And moments later, their welcome message arrives. 

Unlock a Boost in Revenue

It’s our mission to make SMS the #1 revenue channel for merchants and subscriber acquisition is one of the key ingredients to driving revenue growth for your brand.

List growth is the foundation of your SMS and email marketing programs and continuing to acquire new subscribers is key to optimal list health and revenue growth. It’s why we were focused on unlocking a more effective way for popups to give visitors a more seamless experience—and allow stores to keep those visitors on site.

Even though Postscript is a mobile-first company—we want merchants to meet customers where they shop. That’s why we made sure Onsite Opt-in works on desktop too, which means you’re not just limited to improving list growth via mobile phones, like with two-touch. Beyond just the huge growth in SMS list, we’ve seen Onsite Opt-in popups drive 50%+ increases in email opt-in rates for SMS first pop ups.

The tl;dr is that by increasing your conversion rates and list size with Onsite Opt-in, more people receive your messages and offers, ultimately leading to more purchases. 

Early Results

Beauty brand Jones Road was able to acquire as many subscribers in their first two months using Onsite Opt-in as they had all year. Apparel brand True Classic grew their automation revenue by 40% in their first week of implementation.

“Onsite Opt-in will give merchants the highest opt-in rate across all platforms, says Postscript Co-founder and CEO Adam Turner. “Most popups move people off-site, which breaks the cardinal rule of ecommerce. You just paid Facebook to bring that person on your site and now you’re moving them off site to opt-in. This messes with attribution. And Onsite Opt-in solves this problem.”

Visitors will instantly recognize the experience, similar to Apple’s OTP, without having to stop shopping and move into their messaging app to sign up. 

“Onsite Opt-in is the single biggest strategic shift we’ve made at Postscript to date,” says Turner. “This keeps visitors on site, decreases attribution issues, and increases acquisition for  merchants who refuse to use two-tap because of these reasons. We’ve solved these issues with the click of the button. It’s a game changer.”

This innovation in list growth will power a merchant’s owned marketing channels, both in email and SMS, and will drive millions of dollars of new revenue for Shopify brands.

This feature is available now to all Postscript customers, which you can set up following these instructions. To learn more about implementing Onsite Opt-in for your SMS marketing strategy, book a demo here.

Laura Serino

Laura Serino

Senior Manager of Content and Community

Laura is the Senior Content Marketing Manager at Postscript. She has spent the past decade working in ecommerce. When she isn't writing about her favorite topic (marketing) or listening to podcasts about her other favorite topic (ecommerce), she's hanging out with her two sons on an island off the coast of Maine.