it's very important for visual artist or designer to understand color because they usually express their emotions or thinking through color.
They already know theory of color concept very well but they need more practical training through color samples.

This program helps facilitate your color-differentiating ability by finding what color you have difficulty to differenciate and training.
Furthermore, the training for finding interfaction of colors will also help you understand the artist's spectrum.
Color perception consists of hue and nuance(value & chroma). This training is the study for facilitate color differenciation, so you have to differentiate the colors with same nuance condition.

Direction:
When you start the test, you can see the array of color chips on the left side of your iPhone/iPod touch. (you can drag down left color bar)
After some seconds, the chips will move to the right side, and be mixed together.
All you have to do is rearranging the color chips with the same order: to arrange similar color side by side.
The first chip is placed at the very top of the array, and will not move.
You have to find the color chip which is the most similar with the first chip, and place it next to the first chip.
You will have 5 minutes to place all the chips, and the result will be shown.

The result will show you which color you are good to diffrentiate and which color you are not.
According to the result, you can make efforts to enhance your color perception.

May you have eyes of a colorist!