Doesn’t work. Beware.
The app worked for about 12 hours, then would not connect for the remainder of my trip. Make sure you screenshot your Zurich Card codes, and don’t rely on this app for information. Update: DO NOT trust the developer response to this review. Screenshot your Zurich Card code in the app, if the app works for you at all. The ticket is NOT accessible in “offline mode” as the app often will not load at all. Yes, you receive a PDF, but it takes much longer to access—I eventually used a screenshot of the PDF to enter museums. Also worth noting that many restaurants listed on the app have no idea what you’re talking about when you ask about their Zurich Card discounts.