Even in developed countries only a small minority of patients with depression and bipolar disorders receives treatment according to guidelines and the treatment gaps are especially pronounced concerning psychotherapy.

A variety of digital and internet based interventions have been developed mainly building on the principles of Cognitive Behavioral Therapy (CBT). A quite consistent finding is superiority compared to control groups with largest effect sizes when compared to waiting list controls, however the evidence provided by such studies is questionable. More support for efficacy is provided by studies showing a comparable efficacy compared to face-to-face CBT, however sufficiently powered non-inferiority studies compared to antidepressants or face-to-face therapy are needed. Such studies are necessary for deciding whether digital intervention should be integrated in the health care system mainly as a self-management tool or as an alternative to regular treatment with psychotherapy or pharmacotherapy.

A dynamic new area of research explores the value for self-management and treatment decision of longitudinal data generated by the patient via self-ratings, wearables and other biosensors as well as the pattern of smartphone use. Within the BMBF-funded study STEADY a platform will be developed which allows the individual patient to securely store and integrate these data and to analyze them using analytic tools involving time series analyses. An overview will be given of similar approaches started in the last years within mental health.