I can't sign up.
I couldn't open the ticket inside the app (but it did work before). Make sure to have the printed ticket/pdf in case that happens.
This deprecated app should be removed.
Not usable at all, can't do anything with it
die app hat keine funktionen. wtf. ticketkauf unmöglich
Einloggen funktioniert problemlos, Tickets werden übersichtlich und direkt nach dem Kauf angezeigt. Einziges Manko: Der Hintergrund stört und erschwert die Lesbarkeit bei der Ticketansicht.
App appears to be deprecated and broken. Sign-up and therefore ticket purchase is not possible. EDIT: There seems to be a new app, which also works: "GrazMobil". However, it is only available in German and the official public transport website does not refer to it.
Can't register!
The app simply does not fulfil it's purpose. It is designed to display tickets that were purchased online from Holding Graz. These tickets are listed in the app, but cannot be opened to display the QR code required for ticket inspection.
14.12.2019: App didn't say, that the ride would be free and charged the standard price anyway.