Efficacy of a Digital Therapeutic for People With Dysarthria After Stroke

Inclusion Criteria: 1. Neurologically stable, as determined by the clinician. 2. Onset of stroke within four weeks prior to randomization. 3. Diagnosis of dysarthria caused by stroke as confirmed by a stroke specialty neurologist. 4. Maintains enough cognitive function to use the speech therapy application without problems, as determined by a Mini-Mental State Exam score of 26 ≥ within 1 month prior to randomization. 5. Capable of walking or moving alone or with the assistance of a walking aid (e.g., walkers, canes, or wheelchairs). 6. Must have intact vision, hearing, communication skills, and motor skills, as well as comprehension sufficient to proceed with assessment, as judged by the clinician. Exclusion Criteria: 1. Unable to measure articulatory or orofacial functions due to organic causes/lesions in articulatory and cervical structure. 2. Has comorbid neurological conditions that, in the opinion of the investigator, could impair study participation, such as dementia (Alzheimer's disease, vascular dementia, Central Nervous System Infection \[e.g., Human Immunodeficiency Virus, syphilis\], Creutzfeld-Jacob disease, etc.), Pick's disease, Huntington's disease, or Parkinson's disease. 3. Has a Mini-Mental State Exam score of 26 or below at the time of screening. 4. Has a Clinical Dementia Rating score of 1 ≥ or a Global Deterioration Scale score of 3 ≥ at the time of screening. 5. Received dementia treatment within 3 months of screening. 6. Takes medication that may impact cognitive function during the clinical trial period. 7. Co-medication is prohibited during the entire trial period for the following medications: drugs for dementia treatment, Central Nervous System stimulants, anticholinergics, tricyclic antidepressants, typical antipsychotics, and sleeping pills (excluding rapid-acting sleeping pills). 8. Co-medication is permitted if continued use of the following medications has been at a stable dose for 2 months prior to randomization: atypical antipsychotics, anxiolytics, antidepressants (excluding tricyclic antidepressants), thyroid hormone, and rapid-acting sleeping pills. 9. Is uneducated or illiterate. 10. Has been diagnosed with a serious mental illness such as severe depression, schizophrenia, alcohol addiction, or drug addiction. 11. Unable to use D-ST01 due to severe speech impairment, as determined by the clinician.