University students face increasing academic and psychosocial demands that place them at risk of reduced psychological well-being. Positive psychology interventions have demonstrated efficacy in promoting mental health; however, few are grounded explicitly in Seligman's PERMA model and adherence to digital interventions remains limited. This randomized controlled trial aims to evaluate the efficacy of a brief PERMA-based psychological intervention delivered via a smartphone application, with and without supplementary telephone multiconference support, compared to a waiting list control group. The intervention consists of five weekly modules targeting Positive Emotion, Engagement, Relationships, Meaning, and Accomplishment. Assessments will be conducted at baseline, post-intervention, and at six-month follow-up.

Inclusion Criteria:

• Being an actively enrolled university student at the University of Santiago de Compostela (USC)
• Having access to a smartphone with an internet connection.

Exclusion Criteria:

• Having a current diagnosis of severe psychiatric disorder, including major depressive disorder with psychotic features, bipolar disorder, schizophrenia, severe cognitive impairment, dissociative disorders, or active substance dependence
• Having started psychological or psychopharmacological treatment within the two months prior to the study or participating in another mental health-related study
• Having insufficient proficiency in Spanish, or presenting sensory, cognitive, or physical impairments that would prevent engagement with the intervention
• Planning to move out of Galicia within the next 12 months.

Researchers will report study results through publications. The data supporting these findings will be presented in the main publications, and the datasets used during the study can be obtained from the corresponding author on reasonable request.