peer reviewed ; The mobile app Schnëssen is intended to establish a state-of-the-art digital platform to collect data on the present-day language situation of Luxembourgish by means of crowd-sourcing and to document and present results to a broader public. Users can participate in a large set of audio recordings tasks and in sociolinguistic surveys. By presenting all audio recordings via an interactive map, participants can explore the language variation of their language. In the first year of data collection, around 210.000 recordings could be collected for numerous variation phenomena from all linguistic levels and over 2800 sociolinguistic questionnaires have been filled out. The app allowed us to compile thus the largest systematic spoken language corpus of Luxembourgish.