iHirn is an application that allows training on cognitive training tasks in different variants. The tasks are designed to challenge and foster the working memory. Regular training with these tasks are assumed to improve attention, memory and reasoning. The training paradigms were developed in research projects carried out at the University of Bern, Switzerland. The tasks can be used for participants over their whole lifespan in either a single or a group setting. There are no special skill requirements in order to train with these tasks. iHirn generates detailed training data for each training task and allows visualizing the training performance. Currently, iHirn is available in two different languages (English, German).