PUI is a lifestyle app available on Android that encourages users to stay active by walking. By simply walking, users can accumulate points daily, which can be redeemed for various rewards such as gift cards from Amazon, PayPay, and Apple. The app enhances the walking experience by allowing users to check in at nearby spots and earn additional points, as well as participate in group challenges with friends to boost their point earnings. Users can also gain points by interacting with other PUI users and playing games within the app.

In addition to rewarding users for their physical activity, PUI also serves as a health management tool. It tracks daily steps and provides insights into calorie consumption. The app features unique characters, Dōji and Marumaru, which can be customized with various parts collected through gameplay. This combination of fitness tracking and gamification makes PUI an engaging option for those looking to integrate fitness into their daily routines.