BurnFriends is a lifestyle app designed to help friend groups achieve fitness goals together. It functions as a virtual pet that encourages users to complete fitness challenges and track their progress by reading step count data from HealthKit. The app is exclusive to iPhone devices and focuses on setting weekly step goals, completing daily challenges, and adding friends for mutual motivation.

Users can customize their daily step goals, with 5,000 steps set as the default target that can be adjusted for varying difficulty levels. The app allows flexibility in making up missed steps throughout the week, emphasizing the importance of meeting goals by Sunday. By connecting with friends on BurnFriends, users can engage in friendly competition and support each other in reaching their fitness milestones.