Going a little off topic, but how to go about getting tickets for trains etc?

Is there an app? Ivie? 51 euros for say a 3 pass + airport transfers.


Seems you have to add CAT trains onto a Vienna travel card, but not 100% sure if the S7 etc. are included already (although maybe classd as being outside the city zone)?

Would like to have something in place on my phone ideally before arrival so that I'm not ganging around longer than need be.