Online asthma management for children is cost-effective

eHealth interventions have been proposed as an appealing method to improve health outcomes and reduce healthcare costs [1–3]. However, the development of an eHealth intervention is associated with high costs and this investment needs to be balanced by increased clinical effectiveness and related cost savings. Unfortunately, solid evidence for the effectiveness of eHealth with regard to health improvement is still limited [2–5], as is evidence regarding cost-effectiveness. This causes uncertainty about the effectiveness of eHealth and constitutes a barrier towards successful implementation in daily practice [6, 7]. Thus, it is necessary to assess both effectiveness and cost-effectiveness to convince colleagues and policymakers of its added value.