In the last year, I've been through over a dozen cities and used public transport in all of them. It is wild just how confusing and complex buying a ticket can be. While some cities obviously take a user-centred approach to ticketing, others appear to take a Kafkaesque delight in a bureaucratic maze of zones, apps, and intricate restrictions. One of the seminal texts in computer systems design…
It can give clear information about tickets and tariffs, but not all do! The region or operator can also give clear info on their website, but not all do. If they don’t put it on the website, why would they put it on the app ?
If the app has tickets it often includes information about these tickets. Not all do but most of them
About those tickets. I’ve been bitten at least once by an app not even mentioning a paper ticket that was cheaper for my journey. And once by an app not mentioning that the needed ticket not available on the app could not be bought from the driver either, but was on a different app, but there we 're getting into Paris levels of silliness !