The current study will investigate if QbMobile can be used to improve the accuracy and objective identification of reduced ADHD symptoms in tests scores once treatment has been initiated.

This 4-week study will evaluate QbMobile's performance in monitoring ADHD treatment response. Participants will complete the 10-minute QbMobile test on their personal device during a scheduled clinical visit. They will then repeat the test remotely the following day before beginning their ADHD medication treatment. At week 2 and week 4, participants will take QbMobile remotely at least 1 hour after taking their ADHD medication and no longer than 4 hours post dose.

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.

Participants will be selected from referrals or participating site's ADHD data base.

Due to the nature of the research, limited access to supporting data may be granted upon reasonable request under confidentiality agreements from the corresponding sponsor.