What I Like
This is my tool of choice because of how easy it is to use. It automatically serves up a bunch of color palettes, and it also has a sidebar with a bunch of themes. I really like that search bar at the top that lets me search by two colors (a situation in which I often find myself).
Copy/paste is very intuitive. Other sites make me think about this way too much, but here I can do it without breaking the flow my brain is in.
I also really appreciate the discrete ads. I respect that they keep the tool free, but they’re also done in such a tasteful way that I notice them without being distracted.