Having looked at the tool, I'm wondering what OP expected. I "used" it for 10 seconds, and am still wondering why I'd need it or what the provided value is over "extract colors and order them in a list". Color scheming shouldn't start in your editor IMHO.

Paid use is based on perceived utility, and donations (to me) go to a perceived need (and if there's utility on top, that's great). This app doesn't cry "I need money to do X", so I'm not sure why the author even expected donations, and "boatloads of traffic" isn't a reason that gets me to donate, really.