The objective of this project is to understand the potential effectiveness of a 4 week Mindfulness-Based Cognitive Therapy intervention delivered using a smartphone application for reducing anxiety and stress within college students. Although in-person mindfulness-based cognitive therapy approaches have been found effective for reducing anxiety and stress; given the pervasiveness of anxiety and stress in this population, there is a need to provide alternative and accessible interventions to improve students' mental health. One such approach may be by leveraging existing tools such Sanvello - a free mindfulness-based cognitive therapy smartphone application - which could more easily be deployed across a broader population. Accordingly, using a cluster-randomized controlled design, this intervention will assess the extent to which 4-weeks of using the Sanvello application was effective for reducing anxiety and stress within college students.