Effectiveness of HabitWorks and Symptom Tracking for Anxiety and Depression

The objective is to conduct a randomized controlled trial (RCT) that compares two digital interventions - Symptom Tracking and the HabitWorks app - in a sample of adults endorsing symptoms of anxiety or depression. The investigators hope to obtain pilot data to support a fully powered RCT to test moderators: 1. Target engagement (improvement in interpretation bias) 2. Feasibility and acceptability of Symptom Tracking and HabitWorks and procedures for a general community sample 3. Symptom and functioning measures

Inclusion Criteria: 1. Age ≥ 18 at the time of consent (19 in Nebraska, 21 in Puerto Rico based on age of consent) 2. Current US resident 3. Total score ≥ 3 on the Patient Health Questionnaire-2 (Kroenke et al., 2003) or Generalized Anxiety Disorder-2 (Spitzer et al., 2006), indicating at least mild depression and/or anxiety symptoms 4. 24-hour access to an iPhone smartphone 5. ability to understand English Exclusion criteria: 1. No current psychiatric symptoms that would prevent informed consent, understanding of research procedures, or ability to complete the study (e.g., active symptoms of psychosis, mania) 2. No medical symptoms that would prevent informed consent, understanding of research procedures, or ability to complete the study (e.g., physical disability)