Leonard, I’ve used the application you linked to and I found it to be alright. I think it gets into the weeds too much and I found myself spending more time trying to configure all of the dials and such and end up worse than I started. One app I found for modern color scheme generation is:
Might want to give it a look. It’s much simpler and easy to use, I think. Minimalist design is hot right now with a pastel color scheme. You can pretty easily make some beautiful designs using some simple techniques.