In my country, the EasyPark app seems to have taken a lot of the market. Almost every parking space I see now has it as an option, including spaces owned by the city. Thankfully, they currently still support paying with cash, but machines often don't return change and only accept coins, so they can be inconvenient.

It's shocking to compare the privacy aspect of the app: instead of anonymously throwing some coins into a machine and putting a slip on your dashboard, the app needs: your phone number, your plate number, your credit card details and full GPS access. They're not hiding this: It's explained in their GDPR privacy notice that they track and store your phone location and travel routes even when you're not using a parking space.

On top of that, you also pay more for parking when using the app, since they take some percentage commission of the parking cost (apparently depending on your account options, but I never got far enough with the app to find this out)