Ah, that table is helpful, and I definitely didn't notice a link to it before. Still, without a card for the "free tier" directly on the pricing page, you get the impression there are only paid options. I wouldn't think to click that to see details about a free tier, since (to me at least) the label implicitly is saying "Compare Features (of the pricing tiers shown on this page)".
Also, on the comparison chart, you could just say something like "Cards per slide: 3 / Infinite / Infinite / Infinite" and do away with the hover text.
I have made the comparison table link a bit more prominent on the pricing page so hopefully it's less ambiguous now.