By just sharing their referral link with others, frequent travelers can potentially save a significant amount of money on their next trip. Another popular refer and earn app is Uberrummy all new app, which offers cash rewards to new users who sign up using referral codes, as well as to the referrer. Uber has found that using word-of-mouth recommendations to draw in new drivers & passengers has been a successful tactic. To top it off, Cash App has a simple referral program that lets users get paid for referring friends who download the app and send money.