Executive summary included. This document presents the final work of the master's degree done in the postgraduate course in the School of Industrial Organization of Madrid. In particular, it is a project of entrepreneurship following the Lean Start-up methodology. Analysing current society and its needs, it has been noticed the large number of diseases whose origin lies in food. It has also been observed that more and more, the population is aware of the importance of a balanced diet to health. Therefore, and based on these two premises, it was raised what could be done to help the population to bring healthier diet and improve their health. Thus, it was decided to develop the mobile application: Carrot, the Healthiest Comparator. The initial objective considered with this application was to solve a problem facing the majority of the population and it is to find time to look for the most suitable food for each person among the immense food supply. With the current pace of life and increasingly demanding work requirements, the consumption of ultra-processed foods is increasing, resulting in less healthy nutritional habits. Once the project was made clear, different experiments were carried out, developed later in the operations plan, with the aim of adapting as much as possible the application to the real needs of the population.