Use of Color

Ensure color is not the only way information is conveyed. Not everyone can perceive color. For example, include shape in your instructions, such as a green check mark or red cross. And inside a legend of a map, use numbers in addition to color, to allow people who are color blind to find what they are looking for.

Impact#

• Color can be perceived less well by people who are color blind or who are elderly.

• Use a red cross or green check mark for feedback to make the feedback clear for people who do not perceive color very well.

• With a legend, use numbers in addition to color so that people who are color blind can also find what they are looking for.

• Do not only use color for required fields, but also add text so that blind or colorblind people perceive the field is required.

Check#

“Is all information on the screen also clear without the use of color?“

This can be tested visually, no assistive technology is needed.

Solution#

When designing an app, keep in mind that information is not conveyed through color alone.

Calculate contrast#

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