Inclusion Criteria:  Meet DSM-5 criteria for at least one past major depressive disorder, persistent depressive disorder, or unspecified bipolar disorder Be 13-17 years old English speaking and able to complete written questionnaires Ability to attend pre-determined group session time(s) Access to a smartphone to engage with the study app Medication usage is acceptable, but not required  Exclusion Criteria:  Regular use or current abuse of a psychoactive drug Evidence of behavioral problems that are thought to interfere with group treatment Suicidality that requires more intensive treatment Meeting DSM 5 criteria for bipolar I or II disorder, a psychotic disorder, or significant psychiatric symptoms (e.g., self-injurious behavior) that require more intensive treatment Concurrent participation in cognitive-behavioral therapy Inability to travel to study sessions and assessments