Mobile apps that offer users the chance to make money through a variety of activities are known as money-making apps. As more people look for flexible ways to augment their income, these apps have brummy app 51 bonusecome more and more popular. Popular categories of apps that generate revenue consist of:. 1. Survey apps: Users respond to questionnaires covering a range of subjects, giving businesses and market research organizations insight into their preferences. 2. Cashback apps: These give users money back in the form of redeemable points or direct cashback for purchases made at participating stores.