Have you ever wondered why some digital interfaces convey immediate trust, while others seem unengaging or even off-putting? Often, the answer lies in the colors.
A study by CCICOLOR – the Institute for Color Research – shows that it takes between 60 and 90 seconds to form an opinion about a product, and that 62% to 90% of this opinion depends on color alone.
In UI Design, color is not a decorative element. It is a strategic design tool that influences readability, orientation, user behavior and the overall performance of the interface.
The role of color in interface design
Color as a cognitive, emotional and behavioral lever
Color works on three main levels:
Cognitive: it helps distinguish and understand content hierarchies.
Emotional: it evokes feelings and stimulates emotional associations.
Behavioral: it guides actions and decisions, such as clicking a CTA.
As Nielsen Norman Group points out, a well-designed color combination improves functional clarity and facilitates the user’s interaction with the interface.
The meaning of colors in UI Design
Recurring color associations
In Visual Design, colors take on symbolic meanings that go beyond aesthetics. Some established associations:
Blue: trust, security, serenity
Red: urgency, energy, attention
Green: confirmation, balance, well-being
Yellow: optimism, warmth, warning
Black: elegance, power, exclusivity
White: purity, clarity, minimalism
As highlighted by the Interaction Design Foundation, the choice of colors must always be adapted to the target audience, the cultural context and the functional goals of the interface.
Adapting the color combination to the user
Age and visual preferences
Color preferences evolve with age:
Children: prefer bright, contrasting colors.
Adults: tend to choose more neutral, sober tones.
Applied examples:
Duolingo Kids: lively, interactive palette.
MyChart (health app): soft, reassuring colors, designed for senior users.
Result: greater visual comfort, less cognitive frustration.
Gender and color perception
Research published in the International Journal of Human-Computer Studies (2003) suggests:
Men prefer saturated, sharp colors.
Women favor more complex, subtle shades.
A word of caution: these data do not justify stereotyped approaches. It is essential to rely on real data and tests with representative users.
Culture and color meaning
The meaning of colors changes radically from one culture to another:
White: purity in Europe, mourning in some Asian cultures.
Red: danger in the West, good luck in China.
If your product is aimed at international markets, make sure to localize the color strategy too, avoiding misinterpretation.
How to create an effective color palette
The 60–30–10 rule
A useful principle in visual design is the 60–30–10 rule:
60%: dominant color (backgrounds, main layouts)
30%: secondary color (text, boxes, secondary elements)
10%: accent color (CTAs, highlights, functional icons)
Example:
In a clothing e-commerce site:
Beige as the background (60%)
Navy blue for text and icons (30%)
Deep red for purchase buttons (10%)
The result is a balanced visual hierarchy and more intuitive navigation.
Performance and conversions: the color that gets clicks
A/B tests and real metrics
A HubSpot experiment compared two CTAs with different colors:
Red CTA: +21% clicks compared to the green one.
The moral: no color always wins. Context is everything. Testing is the only way to decide which color combination in UI design works best.
Accessibility and color inclusivity
The WCAG criteria to follow
An effective color palette must be accessible. The WCAG guidelines require:
A minimum contrast of 4.5:1 between text and background.
Not relying on color alone to convey information (e.g. form errors, system states).
Useful tools:
WebAIM Contrast Checker
Color Oracle (color blindness simulator)
Stark (plugin for Figma, Sketch, Adobe XD)
Design systems such as Material Design and Carbon Design System include tested accessible palettes, ready to use.
How to validate color choices
Recommended testing methods
Before releasing a palette, it is essential to validate it. Here are some methods:
A/B tests: compare two versions and measure CTR
Moderated tests: observe users in action
Unmoderated tests: collect feedback at scale
Key questions for testing:
What is your first visual impression?
Is the text readable everywhere?
Where did you click first?
Do the colors seem trustworthy?
Would you change anything in the combination?
Conclusions
In UI Design, the color combination is not a stylistic detail: it is a strategic asset. It influences:
The user’s attention and orientation
Trust in the product
Performance in terms of conversion
Accessibility and inclusivity
An effective palette is the result of design intent, real data and attention to the user experience.
