Research-based assessments (RBAs), such as the Force Concept Inventory, have played central roles in many course transformations from traditional lecture-based instruction to research-based teaching methods. In order to support instructors in assessing their courses, the online Learning About STEM Student Outcomes (LASSO) platform simplifies administering, scoring, and interpreting RBAs. Reducing the barriers to using RBAs will support more instructors in objectively assessing the efficacy of their courses and, subsequently, transforming their courses to improve student outcomes. The purpose of this study was to investigate the extent to which RBAs administered online and outside of class with the LASSO platform provided equivalent data to traditional paper and pencil tests administered in class. Research indicates that these two modes of administering assessments provide equivalent data for graded exams that are administered in class. However, little research has focused on ungraded (low-stakes) exams that are administered outside of class. We used an experimental design to investigate the differences between these two test modes. Results indicated that the LASSO platform provided equivalent data to paper and pencil tests.