There are two types of apps: free and paid. Top money-making apps are usually paid. In-person and online, in-store and online, money at risk, filling out surveys, passive way to earn money, short surveys, free to download, online shopping, and quick, easy money are all differences between free and paid apps. Free apps are generally less reliable because ads support them. Paid apps don't have this problem because people have to pay. This means that the developers of paid apps can spend more time perfecting their products. However, there are some great free apps out there. It just takes a little more time to find them.