Diets to Gain Muscle is an Android application developed by STR LABS, which aims to help users follow a diet plan to build muscle. The app provides various diet plans, including free diets in Spanish, of different durations and characteristics, energy intake, protein intake, and more. Users can choose the one that best suits their metabolism and objectives.

In addition to providing diet plans, the app offers a shopping list with all the necessary ingredients for the diet, a graph to track weight evolution, ideal weight calculators, BMI, protein intake, and calories consumed. Moreover, the app includes a theoretical section that provides basic notions to help users choose the most appropriate diet for their metabolism and objectives.

The app is completely free, in English, and regularly updated with new diet plans. Users can share the diet they are following and their weight evolution with their friends. The app also provides notifications at meal times to remind users to stick to their diet plan.

Overall, Diets to Gain Muscle is a comprehensive app for anyone looking to build muscle. With its variety of diet plans, shopping list, weight tracking, and theoretical section, it's an excellent tool for anyone who wants to gain muscle and improve their health.