Gain Weight Fast in 30 Days is an Android app developed by QLIntelligence that aims to provide a comprehensive guide for girls on how to gain weight fast. The app offers various features such as exercise challenges, workout plans, and a healthy diet plan to help users achieve their weight gain goals.

The app provides a 30-day challenge for girls to gain weight through exercise, which includes a workout plan to build muscle and increase weight. There is also a guide to build muscles at home in 30 days and a workout plan specifically designed for skinny girls to gain weight and build muscle. The app also offers a list of healthy foods to gain weight fast and a diet plan to gain muscle.

Moreover, the app comes with a weight analysis tool that estimates the perfect weight according to height and a calorie calculator that estimates the number of calories to consume daily to achieve the selected goal.

Overall, Gain Weight Fast in 30 Days is a useful app for girls who want to gain weight fast and build muscle. It provides a comprehensive guide and various features to help users achieve their weight gain goals.