Inclusion Criteria:  Age 13 to 18 Able to read and speak fluent English Access to a smartphone Received acute treatment for anorexia nervosa (residential, inpatient, PHP, or IOP) within the past two months Currently receiving weekly outpatient treatment (or planning to start outpatient treatment) for current anorexia nervosa or past anorexia nervosa (e.g., anorexia nervosa in partial remission).  Exclusion Criteria:  Uncorrected visual impairments that would prevent smartphone use Intellectual or developmental disability Medical condition that affects appetite or weight (e.g., thyroid disorder, diabetes, cancer, pregnancy) Current psychotic disorder or substance use disorder BMI-z < 14 or lab abnormalities indicating medical instability Unwillingness for data to be shared with outpatient therapist.