Solid color picker. Works better than other web apps I've tried. Bookmarked for later. Well done app.

What’s the strategy you use to decide which colours are the “main” ones to extract? Do you have a particular algorithm you’re using that you’d share?

The page looks great. That being said, I can see an evident usage via API to check pictures in bulk but I hardly see a use case where I would upload manually my picture on the website. For that I would use the Digital Color Meter app on my Mac (and there are probably equivalent on Windows).