We cannot help you with this because we consider Scard a digital business card, a resource for professional networking. We also believe that it will be used by professionals and freelancers to create leads and possibilities.
If you're seeking those we have mentioned above, you don't need a digital business card or printed cards.
The distinction between the Free and Pro accounts is presentation and functionality. You would have known if you needed to upgrade to Pro when we had given your a 30-day free trial when you signed up. If you're still unsure, why not try out the monthly Pro account for a month before upgrading to an annual Pro account for a lower price?