Bipolar Disorder is a common and complex mental disorder with a prevalence of 1-2 % and accounts as one of the most important causes of disability at age 15-44 years worldwide. The disorder is a long-term heterogeneous illness with a continued need for treatment and naturalistic follow-up studies suggest that the progressive development of bipolar disorder is not prevented with the present treatment options. Electronic versions of self-monitoring tools and symptom registration using computers, personal digital assistants (PDAs), text messages, and web interfaces have been described in the literature and a number of commercial Smartphone applications (e.g. Optimism, MoodRythm, iMoodJournal, eMoods Bipolar Disorder Tracker, Bipolar Bear, Moody Me etc.) for patients with bipolar disorder are available on the market.