A lot of Androids (the ones I have kicking around) don't have a scanning app that comes with the OS so you have to install one, I think most of those use a commercial or open source QR code scanning library that they got from somewhere but not always the same somewhere.
For my three-sided cards I finally realized I can just put a URL to a web-based QR code scanner on the back of my cards and not have any trouble navigating all the scammy looking listings you see when you look for a QR code reader on the play store.
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I assume all Androids that are still getting updates have the same scanning code
A lot of Androids (the ones I have kicking around) don't have a scanning app that comes with the OS so you have to install one, I think most of those use a commercial or open source QR code scanning library that they got from somewhere but not always the same somewhere.
For my three-sided cards I finally realized I can just put a URL to a web-based QR code scanner on the back of my cards and not have any trouble navigating all the scammy looking listings you see when you look for a QR code reader on the play store.