QR-Code Generator might be a bit more popular than card.io. We know about 1 link to it since March 2021 and only 1 link to card.io. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
First thing I tried was typed card.io in my web-browser to see whether it would bring me to a website associated with this game. Source: almost 2 years ago
You're getting all sorts of responses OP, I'll chime in with another possible option being a QR code on your phone's lock screen. I used qr-code-generator.com to create one that I print on the back of business cards that takes people to a page of links on my website, but a photographer friend of mine has one on his iPhone's lock screen that does the same thing to a linktree. Source: about 1 year ago
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