Developmental education, in which college students deemed unprepared for college-level coursework enroll in non-credit-bearing courses, is widespread in American higher education. This study evaluates the effect of mobile app courseware on the college outcomes of developmental education students. We used a research design that randomly assigned course sections to receive access to the apps or not. The results show that access to the apps significantly improved student performance in developmental education outcomes and marginally improved medium-term college persistence and performance but did not affect credential attainment in the study timeframe. Despite a number of barriers to implementation, the results suggest the intervention has the potential to improve the short-term outcomes of developmental education students in addition to being low-cost and scalable.