WellBe! is a smartphone app developed according to the principles of Positive Psychology, which aims to allow users to build personal resources and use techniques that can help them manage their stress. WellBe! allows you to monitor stress levels and intervene in a personalized way to ensure better psychological well-being. WellBe! guides users on a paths, in which daily self-help exercises are proposed. Wellbe! exercises have been chosen based on their proven effectiveness in the scientific literature.