The daily electronic self-monitoring Smartphone software "MONARCA" was used by 17 patients with bipolar disorder for 3 consecutive months. Patients were rated fortnightly using Hamilton Depression rating Scale 17 items (HDRS-17) and Young Mania rating Scale (YMRS) (102 ratings) with blinding for Smartphone data. Objective Smartphone measures such as physical and social activity correlated with clinically rated depressive symptoms. Self-monitored depressive symptoms correlated significantly with HDRS-17 items score.