Potential energy diagrams have been central tools for chemistry teaching and research for over 50 years. We present an application, EveRplot, which is accessible by web browser (including mobile devices) and can be used to create energy versus reaction coordinate plots quickly and easily. Through three case studies, we illustrate the use of the application for both teaching and research. In addition, we provide a handout that outlines how the application may be used in the context of a class on physical organic chemistry.