But the sheer diversity of apps is a problem for large venues, such as sports arenas, as they try to get thousands of people through the gates quickly. Many have embraced the CLEAR Health Pass, offered by the same company that sells shortcuts through airport security. It combines proof of vaccine and photo ID on one color-coded screen, designed to be checked at a glance.
"It works fantastic," says Eric Schossow, standing in line to get into a Seattle Kraken hockey game last Saturday night. "Generally speaking, it takes 20 seconds to get through the door."
"I don't think there's enough protection in the United States regarding facial recognition"
But others are taken aback by the fact that the app requires users to upload their photo IDs, and then pose for a facial-recognition selfie.