The pricing is IMO going to hold back adoption of this product. There's a free plan, but with 3 boards and 50 cards, that's just a quick demo. There's no way you could do anything serious with that. It's not even enough to seriously try out the product.

Then it jumps to $60 a year. I know the standard line about a cup of coffee, blah blah. That's a lot of money for most folks in a very crowded space. (I won't comment on product differentiation.) For someone that uses this heavily, I'm sure $60/year is a great deal. Very few people will, and they'll just move on.

In my opinion, for this to have any chance of catching on, it needs either a real free tier, or a low-price tier of maybe $20/year. Storage is a great way to differentiate tiers because everyone knows storage costs money. 100 boards and 10,000 cards plus 200 MB of storage for the free plan, upgrade to 5 GB of storage for $20/year, or get the current basic plan for $60/year.

As someone that has evaluated many products in this space, I really think you need to reconsider your pricing. You're using the wrong mindset if you expect someone to drop $60 to try out your product.