Understanding Refer Earn Apps: A Complete Guide Refer Earn Apps, which capitalize on online word-of-mouth advertising, have grown in popularity as a digital marketing toolbigg boss 6 keerthi. By providing rewards to both the referrer and the new client, these applications encourage users to suggest goods or services to their social network. Usually, when two users share a special link for registration or a purchase, both parties get rewarded—bonuses, discounts, or money—when someone uses the link to sign up or make a purchase.