Pedagogical research shows that teaching methods other than traditional lectures may result in better outcomes. However, lecture remains the dominant method in economics, likely due to high implementation costs of methods shown to be effective in the literature. In this article, the author shows significant benefits of using a teaching app for clicker questions and exit tickets (a digital one-minute paper) in lectures with minimal time commitment and outside preparation. The use of the teaching app improved exam performance by over 8 percent, on average, compared to a control section of traditional lecture and discussion in principles classes.