Squat Challenge is a free Android app developed by Vandersoft that offers a 1-month program to exercise legs, butt, and thighs. The app provides 30 days of pre-programmed squat exercises with six levels of difficulty to choose from, catering to all fitness levels. The program slowly increases in difficulty as users progress towards day 30. Squat Challenge also includes rest days to allow muscle recovery and exercise demo videos for each movement.

The app's user interface is simple and easy to navigate. Users can track their progress and receive reminders to complete the day's challenge. Squat Challenge is a great way to stay motivated to build muscle and burn fat, and the included exercises, such as Air Squat, Jump Squat, and Wall Sit, are effective in targeting the lower body muscles. Overall, Squat Challenge is a useful app for anyone looking to improve their leg strength and fitness.