Device-to-device audio communication (think QR codes, but made out of sound) seems very underrated. Much better UX than QR codes or NFC because you don't have to worry about putting your phone in the exactly right place or pointing it in the right direction.

Anyone here with more detailed takes on this?

Non-expert personal opinion: Audio communication is susceptible to interference, especially over longer distances. If devices need to be in very close proximity, why not go back to NFC? Perhaps using Bluetooth or WiFi that many devices already have could be a more general choice.

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> Audio communication is susceptible to interference, especially over longer distances.

I'm thinking distances of like 1m. Humans can pick up individual audio streams just fine, I see no reason why algos should not be able to pick up specially crafted streams!

The situations I have in mind are more like consumer-merchant payments, signing in to a physical venue, etc than like making your own two devices talk to each other. For the latter, of course bluetooth works fine.