COPEFA-Pesticide is a decision support tool for farmers, agriculture teachers, students, and enthusiasts, who seek sustainable agriculture methods. The app helps users choose the best pesticides in European countries, especially Croatia, Germany, Turkey, Romania, and Italy based on the conditions of land, temperature, slope, etc. Users can also apply the outputs to define the best time of using pesticides before harvesting. The app has been designed in a simple way, so a wide range of users can easily apply it.