I can pay for parking here in Edinburgh using the RingGo app - which is incredibly convenient, means I don't have to hunt for change - which I rarely have as I mostly pay for everything else with a card.
I love the way it reminds you if your paid for parking period expires and gives you the option of extending by paying more - all without having to return to my car.
Edit: I also don't pay for parking very often - which means I'm even less likely to have change on me or in my car.
Edit2: If somebody allows me to contribute to leaving presents for colleagues through an app then I could go pretty much cash free!
Regarding Edit2: Splitwise[0] is an app my friends recently introduced me to. We tend to get together in groups of 6+ and then go someplace for a weekend. This app made our most recent such trip very easy to split costs on.
I love the way it reminds you if your paid for parking period expires and gives you the option of extending by paying more - all without having to return to my car.
Edit: I also don't pay for parking very often - which means I'm even less likely to have change on me or in my car.
Edit2: If somebody allows me to contribute to leaving presents for colleagues through an app then I could go pretty much cash free!