Success Criterion 1.4.1 - Level A
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.