This is an R Shiny App that calculates Differential Alignment. Derived from the paper: Taylor, J. A., Polanin, J. R., Kowalski, S. M., Wilson, C. D., & Stuhlsatz, M. A. (2022). Addressing test fairness in education research: A process for quantifying the alignment between outcome measures and education interventions. Social Sciences & Humanities Open, 6(1), 100312.