Kiếm Tiền app is a free Android application developed by Rafaela Kottke. It falls under the category of Utilities & Tools and offers users the opportunity to earn cash by completing simple tasks. With this app, users can use any smartphone and receive daily red envelopes from the sponsor. The app's interface is user-friendly and the tasks are quick and easy to complete. By participating in these tasks, users have the chance to earn a significant amount of cash, with daily earnings ranging from 500K to 3800K. Kiếm Tiền app provides a convenient way for users to supplement their income by completing tasks on their smartphones.