An Investigational Study Examining the Efficacy of QbMobile in Treatment Monitoring in Individuals With ADHD

Inclusion Criteria: * Provide written informed consent (including parent/legal guardians consent when this is required for individuals under 18 years old and assent as is required based on the age of participant) for QbMobile; * Aged \> 6 years and \< 60 years old; * Referred for an ADHD assessment or has a diagnosis of ADHD but not currently receiving any type of stimulant or nonstimulant medication treatment; * Meets DSM-5 or ICD-11 criteria for a primary diagnosis of ADHD (combined, inattentive, or hyperactivity/impulsive presentation) per sites standard clinical care evaluation; * Qbtech Rating Scale total score of \>24 at Visit 1; * Have adequate sensory and physical ability to complete QbMobile; * Possess or has access to an iPhone model that supports QbMobile. Exclusion Criteria: * Intellectual disability designated by IQ\<75); * Has used psychostimulant medication within 7 days prior to Visit 1; * A concurrent medical diagnosis that could significantly affect test performance (brain injuries, Parkinson's disease, current epilepsy or active seizures, amyotrophic lateral sclerosis (ALS), multiple sclerosis, dementias (e.g., vascular dementia, Alzheimer disease, etc); * Other conditions that could affect test performance (migraine or other types of severe headache, chronic or acute pain); * Substance use (e.g., alcohol, drugs) that may affect performance on the day of the test.