QbMobile is a software application for the administration of QbTest on a smartphone and has been established in a normative cohort. The study aim was to evaluate the QbMobile smartphone application in a population being assessed for ADHD and to compare the performance to the established objective QbTest. The smartphone collected the participants’ responses to measure attention and impulsivity, and the built-in camera tracked the participants movements to capture activity along with movement patterns from holding the device. The correlation between QbMobile and QbTest shared parameters and the similarity in symptom levels between tools confirms the feasibility of using smartphone-based data for differentiating ADHD symptom levels from neurotypical symptom levels.