IOU is a quantified self smartphone application. It help the drugs users to observe and control their consumptions. After each drug taking they fill the different field, 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 moralising approach to the consumer, based on quantified self, because a personal investment is a key for the consumers self control.