I don't have a smart phone, so I can't just download the app.

Review quotes from http://itunes.apple.com/us/app/color/id427763573?mt=8&ls=1# :

"Three buttons - and no explanation of what they do and how to make them do what I want. No tutorial, no nothing."

"It's not usable. It's not attractive. Using it doesn't help you understand what it's for."

So apparently even people who download the app don't understand what it's for.