Do I need an app?

No :) It's a web-app. Everything happens in the browser.

Can I update my information?

Certainly, you can log in and update your information at any time.

Does it work on iOS and Android?

Indeed, everything functions seamlessly on both iOS and Android.

Why is there a QR code?

For older phones without NFC, QR codes ensure things always work.

Do I only need only one card?

Absolutely, you can use one card without any limitations.

Do I need a subscription?

No, it's free forever!