This chapter discusses the need for community involvement and stakeholder engagement in the development and implementation of digital public health tools. The advent of digitalization in public health has necessitated an exploration of how to design tools that meet the needs of the community they serve. This can be achieved through a participatory approach that incorporates the voices and perspectives of all stakeholders in a democratic manner. Specifically, this chapter discusses two participatory approaches: participatory design and participatory research. These approaches originate from different intellectual traditions but share a vision of incorporating everyone from the community affected by the intervention or technology. Additionally, this chapter presents application examples from the literature on how the development of health-related applications benefited from participatory research and participatory design to illustrate the added value of integrating these approaches.