One of the Plastc alternatives, I can't seem to find it now, was a device like Plastc, but also a yearly subscription fee, because they promoted the benefits being that the card would automatically switch between your available cards to optimize rewards.

At a gas station you would use the card that had the best gas points. At the grocery store it would switch to the card with the best grocery points...

I was never interested in it, because I don't really want to manage many cards, but I can see the appeal in it.