Belly Increases Mobile App download Rate 200% With Twilio SMS API

June 12, 2012
Written by
Opinions expressed by Twilio contributors are their own

Twilio Bug Logo

How a successful startup satisfied its hunger for more mobile app installs

Belly, a Chicago-based startup that offers a unique customer-loyalty program, was doing well. In just eight months, it had signed up more than 200,000 users and expanded coast to coast, thanks to a quirky set of rewards and an engaging mobile app. The company had also attracted more than $12 million in venture backing from Lightbank, Silicon Valley Bank and Andreessen Horowitz.

But the management team wasn’t satisfied.

“We wanted to make the most of the traffic that was coming to the Belly website,” said Craig Ulliott, the chief technology officer. If a customer signed up for Belly’s program but didn’t install the mobile app, he or she would have a hard time finding Belly merchants and participating in the program. That represented a potentially lost opportunity in a highly competitive market.

Craig Ulliott, CTO of Belly

Ulliott decided to try using SMS for mobile app distribution. After checking out various options, he chose to build a small app with the Twilio SMS API. Twilio was easy to add to Belly’s website ( and provided more flexibility and control.

Within 45 minutes, Ulliott tweaked the signup form on the website so that new customers who gave Belly their mobile numbers received an SMS with a link to download Belly’s mobile app. By including a link in the SMS, Ulliott could easily track the number of messages sent and their click-through rate.

“We saw our download rate double after we added the feature,” Ulliott said. “We were thrilled.”

Ulliott said adding the few lines of Twilio-powered code helped remove friction. “To download a mobile app, you used to have to go to iTunes and plug in your phone, and it was sort of a pain. Now you can just sign up with your phone number and you get a text message. You tap a link in the message and it takes you to the app store. The barrier to entry is much lower.”