Bipolar disorder-specific psychotherapy combined with pharmacotherapy decreases relapse risk to new mood episode onset, but psychotherapy is not easily accessible. Smartphone-based interventions provide a means to increase access to empirically supported strategies for bipolar disorder self-management while also providing an opportunity to increase the efficacy of these strategies by using real-time assessment and adaptive feedback. This presentation will address the design and development of a smartphone-based self-management intervention for individuals with bipolar disorder, the outcomes of a recent randomized clinical trial of the intervention, and potential mechanisms underlying these outcomes. In addition, as a guide to the ongoing iterative person-centered development of these types of interventions, participants’ patterns of engagement with the intervention and their feedback about the intervention will also be presented.