IOU is a quantified self application. It helps the drugs users to observe and control their consumptions. After each drug taking they fill the different fields, whenever they have time. No datas are saved online in the aim to protect their intimacy and anonymity. The application generate datavisualisations based on their answers. So they can access their datas and observe the evolution of their uses.
IOU gives a non moralizing approach to the consumer and a key for self observation.
