Waitlist-Control Trial of Smartphone (App-based) CBT for Social Anxiety Disorder (SAD)

Inclusion Criteria: * At least 18 years of age * Current diagnosis of primary DSM-5 SAD, based on MINI * Currently living in the United States Exclusion Criteria: * Psychotropic medication changes within 2 months prior to enrollment i. Participants taking psychotropic medication must have been on a stable dose for at least 2 months prior to enrollment and not change medication during study period * Past participation in ≥ 4 sessions of CBT for SAD * Current severe substance use disorder * Lifetime bipolar disorder or psychosis * Current severe comorbid major depression, as indicated by clinical judgment and/or a QIDS-SR total score ≥ 21 \*\*\*EDIT\*\*\* * Acute, active suicidal ideation as indicated by clinical judgment and/or a score ≥ 2 on the suicidal ideation subscale of the C-SSRS * Concurrent psychological treatment * Does not own a supported mobile Smartphone with a data plan * Lack of technology literacy that would interfere with ability to engage with smartphone treatment