Smile.io, previously Sweet Tooth, is a cloud-based loyalty and rewards solution for online businesses. The company enables retailers to build loyalty programs and encourage customers to earn more points by showing them how close they are to their next reward. It also helps them in building a referral program where they can reward the sender and the receiver when converting sales. Businesses can build a list of VIP members based on the transactions and then offer customized rewards and discounts to those shoppers. Pricing depending on the number of members. The company powers award programmes for more than 15,000 retailers globally as of July 2017.