a HV generally perform better than MS on the app SDMT (p < 0.0001). The number of participants for each cohort are shown below the plot. b Assessment of agreement between the raw app-based score and the written score (HV = 16; MS = 138). The black solid line is the 1:1 concordance line. The orange dashed line is the regression line. c Bland–Altman plot for the written and the app scores. The limits of agreement are −5.29 and 20.84. On average, individuals perform 7.8 points higher on the written test. d The plot of concordance between the written and app scores, after adjusting for the 7.8 points difference.