Inclusion Criteria:  Symptoms of depression indicated by DASS-D score of 10 or above Aged 15 to 64 years (parental or guardian consent is required for those below 18 years) Possess a smartphone with access to the Internet  Exclusion Criteria:  Significant developmental disorder, psychotic disorder, substance abuse or organic brain disorder Active suicidal risk Receiving active structured intervention or anticipating to receive such treatment (e.g., biweekly psychotherapy sessions, receiving pharmacotherapy)