User Engagement and Usability of Suicide Prevention Apps: Systematic Search in App Stores and Content Analysis

Chelsey R Wilks   ¹ , PhD ;   Carol Chu   ² , PhD ;   DongGun Sim   ³ , EdM ;   Josh Lovell   ⁴ , MA ;   Peter Gutierrez   ^{5, 6} , PhD ;   Thomas Joiner   ⁷ , PhD ;   Ronald C Kessler   ⁸ , PhD ;   Matthew K Nock   ⁹ , PhD

¹ Department of Psychological Sciences, University of Missouri-St. Louis, St Louis, MO, United States

² Minneapolis Veterans Affairs Health Care System, Minneapolis, MN, United States

³ School of Theology, Boston University, Boston, MA, United States

⁴ Department of Psychology, Hofstra University, Hempstead, NY, United States

⁵ Rocky Mountain Regional VA Medical Center, Denver, CO, United States

⁶ University of Colorado Anschutz Medical Campus, Denver, CO, United States

⁷ Department of Psychology, Florida State University, Tallahassee, FL, United States

⁸ Department of Health Care Policy, Harvard Medical School, Boston, MA, United States

⁹ Department of Psychology, Harvard University, Cambridge, MA, United States