<p>Self-directed digital health interventions offer a promising approach to treating post-trauma psychopathology. Despite their effectiveness, adherence and completion rates for these interventions are often low. One potential reason for this low adherence is the design of many digital interventions, which frequently lack "sticky" features that promote high engagement among individuals with post-trauma psychopathology. Identifying these features is crucial for improving the implementation of digital health treatments. This study aimed to identify the types of smartphone applications most frequently used by individuals with elevated post-trauma psychopathology to pinpoint such engaging features. A community sample (N = 332) of trauma-exposed adults reported their daily use of smartphone activities (i.e., playing games, using social media, texting, browsing the web, listening to music, watching videos) and completed measures of PTSD, depression, and anxiety. The findings revealed significant positive associations between higher levels of psychopathology and being female with spending more time engaging in smartphone activities. Individuals with higher levels of psychopathology spent more time on mobile games and social media compared to those with lower levels of psychopathology. These results highlight the importance of tailoring digital interventions to align with individuals' existing smartphone habits. Emphasizing social and gamified features in digital health interventions may potentially enhance adherence and engagement among those with post-trauma psychopathology.</p>