Most digital cards make the person you just met download an app, and the big ones only rent you the paid tier. This one is a plain web link. Tap it or scan the QR and it opens in any browser, then one tap saves you to their contacts and to Apple or Google Wallet.
Two things the others don't do. Clinicians and researchers add an ORCID iD and their publications appear on the card and stay current. And Pro has a $99 lifetime option, not only a subscription.
Free, and no account needed to start.