That site's awesome. Simple focused product. It's clear what it does. It's clear what it costs.
only thing i'd suggest is that you add more examples of what where people can put those QR codes. I think most folks in the US don't "get" QR codes, or how they could benefit from them. Also it'd be good google food.
probably a description of how easy it is to scan them on iOS and android. I think a bunch of folks still don't know it's built into the phone apps.
It does not bring in a whole lot, but I like having a side hustle.