Digital enablers are defined as usage of digital tools along with complementary methods and content, devised for addressing particular purposes, in support of engaging citizens in co-creation processes related to Nature Based Solutions (NBS). Their main goal is to offer advantages and opportunities to boost processes of NBS co-creation, co-monitoring and co-development involving citizens and other stakeholders. This article presents and discuss challenges, method perspectives related to the design of a multi-thematic digital enabler: a smartphone application dedicate to well-being. This application has been designed considering a comparative study of five digital enablers, a survey (about smartphone use in relation with environmental monitoring by citizen on felt temperature and also on air, water and soil qualities) and a participative activity lead during Nantes city “Fête de la science” a French national event promoting synergies and dialogue between scientists and citizens.