Simon Goldberg at the University of Wisconsin, Madison, and colleagues compiled data from 14 meta-analyses including a total of 145 randomized-controlled trials (RCTs) of mental health apps among 47,940 participants. The sample size may seem impressive, but the results were weak. Overall, the authors didn’t find convincing evidence that apps were effective, only “highly suggestive evidence” of efficacy for anxiety, stress, depression, and quality of life