The cards used to have "tool" or "action" written directly on them. I am colorblind, so now they look identical. (I'm assuming the strip of color around the edges are blue and purple?) Every time I want to assess the difference, I have to mouse hover or memorize a card. The shapes and borders of the ore and scorium aren't far enough apart either.
Visually, it looks good, but it needs to be functional too.
you are correct that tool cards have a purple outline and actions have a blue outline. I think having a colorblind option with the full word or first letter on the card makes sense. Though if you didnt memorize what the card did you probably shouldn't be playing the card without double checking what it does. Tools all need to be used directly on a resource and actions are all used without targeting anything for example even though aquifer upgrades your resources because you dont target anything its a action.