There are a number of approaches to app monetization to take into account, each with pros & cons of their own. A popular strategy is the freemium model, which provides a basicrummy online apk app version for free with the option to upgrade to a premium version with extra features or content. With this business model, developers can draw in a sizable user base while earning money from a smaller proportion of paying users. Putting advertisements inside the app & getting paid when users click or view them is known as in-app advertising.