Abstract
The "Ö-Tour Challenge Martelltal" app for Android and iOS is an adaptation of the "Giro Challenge" app and allows cyclists to compare their performance to that of other athletes along the stage to the Dobratsch of the Ö-Tour. The app keeps track of the cyclist's trajectory, which is compared to the trajectories already recorded in the database. For easy of comparison, the trajectories are visualized together. Additionally, the App will continuously monitor and predict the estimated arrival time.