Journal of Medical Internet Research.
URL: https://doi.org/10.2196/14567
Abstract. JMIR 21(9):e14567 (2019). Systematic search and panel-based usage analysis finding that even the most popular mental-health apps lose more than 80% of users within ten days, with 30-day retention rates typically below 4%. Quantifies the engagement-cliff that digital therapeutics need to overcome.