The Green Line Vokabeltrainer is an application that helps you learn the vocabulary of the Green Line textbook in an easy and fun way. With this application, you can learn the vocabulary with five different training types, ranging from easy to difficult. You can choose the type of training that you prefer, depending on your current vocabulary level. The app also offers you the possibility to register for a free user account with PONS. With this account, you can get a set of advantages, such as a free user account, the possibility to create multiple lists, an overview of your learning progress, and the availability of additional vocabulary tests.