I just tested coolors out using a screen capture of Spotify desktop on MacOS and it didn't pickup the green color. I guess it's only picking out dominant colors
Colormind picked the green color on all attempts
Edit: after several more attempts coolors started picking up the green color
Colormind interface is simpler and more user friendly I think, I was able to start generating color schemes right away, in coolors tho I had to watch a tutorial to learn what those buttons are.