You can make a SPECIFIC custom color on the iPad or on a computer! Not where you drag the cursor around and hope to land on something you like. Actually make it.
My son was tinkering on the iPad and wanted basic green. The greens on his screen were all shades of olive. Getting a "Christmas Color Green" was proving to be a challenge. I know, I know...but sometimes you get deep into a muddy palette and can't get out. Have you ever wanted a BRIGHTER yellow? A specific pink...bright but not too bright? Sometimes I try to scoot that cursor over just a smidge to see if maybe the color I'm thinking of is SOMEWHERE on the screen. Have you ever referred to a Crayola Crayon Color? Now you can make the EXACT color! It's oh, so easy!
When Matthew asked for "Christmas Tree Green," we started naming our favorite Crayola colors and that led me to a Wikipedia page that listed ALL of their colors. (Google it!) I started playing around and easily was able to make them. I like seeing all of the colors on the page in front of me and I can start to pick out specific color combinations that I want to work with in the future. (Covers, anyone?)
I hope this is helpful and welcome news to you, too. Have a COLORFUL DAY!