Positive psychological interventions (PPI) hold promise for boosting well-being and quality of life in diverse populations, but not much is known about their efficacy as ecological momentary interventions (EMIs, e.g. via mobile applications) in daily life. This meta-analysis uses random-effects models to examine the efficacy of PPI-EMIs compared to control groups (active or passive) and exploring study region, age, gender, and risk of bias as moderators. Overall, 16 studies were included (N = 3397, 69.1% female, M