Digital mental health interventions, which consist of web and mobile applications intended to monitor and treat mental illness, have been met with tremendous enthusiasm over the past decade, and rightfully so. Around the world, mental health treatment is in crisis: we cannot accommodate the majority of those in need with our current service infrastructure. Digital mental health interventions offer a potential solution. They can be widely disseminated with virtually no marginal cost; they promote patient autonomy; they offer convenience, not requiring transportation or daytime appointments; and they can be highly responsive, accessible when patients most need support.