Roamler is an Android app that allows users to earn money in their free time by performing mystery shopping tasks for important brands. These tasks can include in-store checks, filling out short questionnaires, taking pictures, and executing merchandising tasks such as refilling shelves, setting up POS visuals, and building promotional displays. The app offers a variety of mystery shopping tasks in supermarkets, bars, restaurants, cinemas, petrol stations, and other locations.

New mystery shopping tasks are uploaded every day and displayed in the app based on the user's location, skills, and experience level. Each task completed earns the user monetary rewards and experience points which can be cashed out at any time and paid directly to their bank account or through PayPal. Users can also earn experience points to achieve higher levels and unlock more and better-paid tasks.