Constant Contact®, Inc., the trusted marketing advisor to more than 450,000 small organizations worldwide, has acquired privately owned CardStar Inc., the leading loyalty platform that helps shoppers stay connected to their favorite merchants. With over two million users, Boston-based CardStar is a leading developer of mobile applications that extend the use of loyalty cards and mobile coupons among consumers. The acquisition marks the latest milestone in Constant Contact’s evolution from an email marketing company to the leading provider of online marketing tools that help small businesses create and grow customer relationships. Financial details of the transaction were not disclosed.

“The CardStar loyalty platform takes advantage of the anytime, anywhere nature of mobile – making it an excellent complement to our growing suite of engagement marketing tools for small businesses. CardStar’s unique mobile application is a natural extension of our brand, bringing consumers and merchants together before, during, and after the sale to help drive repeat business,” said Gail Goodman, CEO of Constant Contact.