This color blind test checks how well you can tell similar colors apart. Some people may find certain colors and shades harder to distinguish because of differences in how their eyes and brain process color. Learn more about color vision .
Each round shows a grid of colored tiles. One tile is slightly different from the others. Your job is to find and click the different tile as quickly as possible.
As you reach higher levels, the difference between the colors becomes smaller, making the color test more difficult.
Your score is the highest level you reach. A higher level means you were able to spot smaller differences between colors.
Your result is an online performance score, not a medical measurement. Your screen, brightness, color settings, and monitor calibration can all change how colors appear. Research has also found that online color tests can be useful for screening, but differences between screens and devices can affect results. Read the research .
Important: This is an online color vision test and color discrimination challenge, not a medical test for color blindness. If you are concerned about your color vision, an eye-care professional can give you a proper color vision test. Learn about clinical color vision testing .