Drillster provides an adaptive learning and testing app. Unique and truly innovative is Drillster’s capacity to calculate when knowledge declines if not maintained. Drillster sends individual users a notification before important knowledge tends to decline. The learner can efficiently brush up on his knowledge. Drillster ensures that crucial knowledge remains top of mind year-round, not only at the moment of the recurrent training. Various international airlines already benefit from the added value. They realized increased compliance levels, reduced stress levels, and important cost savings on initial and recurrent training programs. Moreover, using the app can even make (recurrent) tests obsolete.