During an acute coronary artery occlusion a part of the heart muscle is deprived of blood causing chest pain or acute chest discomfort and a progressive loss of viability of the affected muscle over the next six hours. The short and long‐term prognosis is largely determined by the time delay between the onset of symptoms and the seeking of medical help. In patients with continuing chest pain of discomfort the decision process to seek medical help is a long process which often takes many hours in uncertainty (median delay is 2 hours in West‐Europe and US. Public campaigns and educational programs could not reduce this time delay). Currently, there are no personal tools that can help the patient to decide to seek early medical help during chest pain. As an acute coronary artery occlusion is associated with immediate electrical phenomena that can be observed on the body surface, and as in the next decade most persons at risk will have a personal smart phone, we propose to develop a new, smart phone compatible, hardware and software application. The purpose of this StarTT‐application is the development of a first prototype device, that is based on a validated patented method developed in our institution. The prototype will be in‐house, validated on healthy persons and in individuals with planned acute coronary artery occlusion during elective coronary angioplasty.