This conceptual article focuses on the potential to advance and extend guardianship using new digital crime prevention applications that have been developed as a consequence of technological advancements in communication and social engagement. The new opportunity structure for informal guardianship through active citizen participation and involvement in crime prevention and control efforts using the Internet and smartphones is discussed to emphasize how this has changed in the digital age. Specifically, the article highlights how the fundamental tenets of guardianship (i.e., what it means to be available, how supervision or monitoring is carried out and ways of intervening) have evolved due to neighborhood watch/community safety mobile applications. Based on what we have learned about guardianship, this article considers the potential for these digital crime prevention applications to extend and support guardianship. It also assesses these applications critically by highlighting some of the concerns and risks that need to be considered amid the proliferation of these new platforms for crime control. The article concludes by weighing up the pros and cons with a view to focusing on key issues in the continued development of such applications so their potential can be maximized.