Color harmony in design refers to the balanced and aesthetically pleasing interaction of colors. Designers use color harmony to influence user experiences, create brand identity, and enhance accessibility. Color harmony is not only about attractive colors but their impact on the overall design.
In this video, Joann and Arielle Eckstut, leading color consultants and authors, give six tips to help designers choose colors:
The Basics of Color Theory: Where Does Color Harmony Fit In?
Color harmony is an application of color theory principles that focuses on the creation of visually pleasing combinations of colors. Color theory is a set of principles and guidelines that explores the relationships and interactions between colors. It provides a systematic way to understand how colors work together and how they affect emotions.
Color theory consists of these fundamental elements:
The Color Wheel

The color wheel comprises the primary, secondary, and tertiary colors.
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The color wheel comprises:
Primary colors: red, blue, and yellow.
Secondary colors: colors formed by mixing two primary colors. These are green, orange, and purple.
Tertiary colors: colors formed by mixing primary with secondary colors. Examples of tertiary colors are blue-green (often called teal) and red-purple (often called magenta).
The color wheel visualizes how colors relate and is an essential tool to choose color schemes.
Hue, Value, and Saturation

In the RGB color model, hue, value, and saturation are the three components of color.
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Every color consists of three components:
Hue is the specific color that makes it different from other colors on the color wheel.
Value represents a color's relative lightness or darkness in grayscale. Value is essential to establish contrast and depth in visual art.
Saturation, also called chroma or intensity, describes the purity and vividness of a color. Saturation can vary from fully saturated (vibrant) to desaturated (grayed).
Using these three components, designers define their color schemes.
Color Temperature

Each color on the color wheel has its own perceived temperature. Yellow to red-purple are warm colors, while purple to green-yellow are cool.
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Color temperature refers to the perceived warmth or coolness of a color. Warm colors (reds, yellows) and cool colors (blues, greens) can dramatically affect the color harmony in a design. Color temperature can influence the mood and emotions of the user.
What Is the Impact of Color Harmony on UX?
Color harmony significantly enhances User Experience (UX) in the following ways:
Draw Attention and Engage Users
An interface's balanced and attractive color scheme can hold the user's attention. For example, an online learning platform might use a subdued, monochromatic color scheme interspersed with vibrant, contrasting colors for important elements. Beyond aesthetics, a serene color palette can minimize visual fatigue, making study sessions more comfortable. This color harmony enhances user engagement over more extended periods.

The IxDF course platform primarily uses a monochromatic grayscale scheme to help users stay immersed as they learn. The use of blue as a highlight helps users quickly identify their progress in the course and get any support they might need.
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Enhance Usability
Designers use color harmony techniques to create contrast in their designs. Contrast aids users by clearly separating content types and functionalities. For example, Ryanair uses color harmony techniques to make essential elements more prominent. This use of color makes it easier for customers to navigate the site, easily understand where they are, and find what they’re looking for.

Ryanair uses a complementary blue and yellow-orange color scheme across its website. A yellow-orange line indicates the current page the user is on. The search button's use of color makes its purpose clear and draws attention to the search function as a whole.
© Ryanair, Fair Use
Readability
Colors with poor contrast can blur elements together and create a confusing user interaction path, the opposite of color harmony. A typical example of poor color balance is when the colors used for text and background make it difficult for users to read the content. Faced with such poor balance, users often choose to leave the site.

In this example, the gray-on-gray text is more difficult to read than the black-on-white text. Text with high contrast against its background vastly improves readability.
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Brand Perception
Colors can symbolize emotions that align with a brand's persona. Brands that promote environmental care often use shades of green and earth tones, which represent tranquility and eco-friendliness. Another example is fast food brands, many of which use red in their color schemes. For some people, the color red stimulates hunger.

The ride-hailing app Uber uses black and white as its primary colors—a monochromatic harmony. The example on the right shows a different color scheme applied—yellow and purple, a complementary color harmony. In this example, the Uber website feels vibrant and almost regal. However, Uber chose black and white to imply elegance and simplicity, which is not symbolized by the yellow and purple scheme.
© Uber, Fair Use
How to Achieve Color Harmony
Designers use a step-by-step process to choose colors that create harmony in their designs. While intuition and taste are involved when selecting colors, there are defined steps, tools, techniques, and tests that designers use to ensure color harmony:
Find Inspiration: Start with broad visual brainstorming. Take cues from nature, art, architecture, or even fashion. Review successful designs within your industry that achieve color harmony. Assemble these inspirations to spot themes and spark potential color ideas.
Select a Dominant Color: This color should align with crucial aspects such as brand ethos, target user group, or the emotions you want to convey. This color forms the foundation of your palette.
Consult the Color Wheel: Use your chosen color as a compass to see different color harmonies on the color wheel. If red is your selected color, an analogous harmony will add red-orange and red-purple to your scheme, while a triadic harmony will add yellow and blue.
Use a Tool or Template: Use color scheme generators or pre-made templates to create harmonious color combinations. These can streamline the creation process and serve as a source of inspiration.
Keep It Simple: Creating complex color schemes with many different colors can be tempting. The more colors you add, the more complex color harmony is to achieve. Start with a simple scheme, and see if it fits your design needs before adding more colors.
Define Color Hierarchy: With your colors identified, assign functional roles to each. The dominant color takes center stage, secondary colors support, and accent colors highlight essential elements such as call-to-actions.
Implement Contrast: Pair contrasting colors for important functionalities and contents, ensuring readability and visual guidance throughout the interface.
Be Mindful of Cultural Contexts: Keep users' cultural color-related attitudes and perceptions in mind. Make sure your chosen palette reads as intended to your target audience.
Prototype and Test: Apply your scheme to your design mock-up, then conduct user testing or surveys. A/B testing is beneficial for color harmony.
Iterate and Refine: Based on feedback, continuously adjust your palette. Ensure it remains relevant to your brand, attractive to your users, and functional within your interface.
What Are the 7 Main Color Schemes?
These 7 schemes serve as a guide for designers to choose harmonious colors. Designers use these schemes as they are or as a foundation to build their color palettes. Remember, while the color wheel consists of 12 main colors—primary, secondary, and tertiary—there are millions of colors with different hues, values, and saturations. Experiment with these color schemes and the array of colors available to you as a designer.
Monochromatic

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When designers use monochromatic schemes, they combine different versions of the same color to create a unified and elegant look. Designers must maintain contrast in these schemes to prevent monotony.
Designers often employ monochromatic schemes in minimalist designs, as using one color reduces distractions. However, the simplicity of monochromatic schemes comes with a limitation: designers cannot utilize multiple colors to aid in visualizing information.

The Uber logo uses the most simplistic monochromatic color schemes—black and white.
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Analogous

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An analogous color scheme involves three adjacent colors on the color wheel. This scheme is often seen in nature, like autumn leaves, as they change colors. There's a variation known as the "high-key" analogous color scheme, created by blending analogous colors with white.
Impressionist artists frequently use this scheme. The result is a shimmering, blurring effect of colors merging. From afar, a high-key analogous scheme might give the impression of being a single color.

The MasterCard logo uses an analogous color scheme—red, orange, and yellow.
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Complementary

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Complementary color schemes pair colors that neutralize each other when mixed, typically resulting in white, black, or a grayscale shade. This approach, also called the "opposite color" scheme, creates a high contrast. Modern color theory identifies these pairs as red/cyan, green/magenta, and blue/yellow.

The Ryanair logo uses a blue-purple and yellow-orange complementary color harmony.
© Ryanair, Fair Use
Triadic

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A triadic color scheme consists of three colors spaced evenly around the color wheel. To identify these colors, you can place an equilateral triangle on the wheel; each corner will point to a color 120° apart from the others.
Triadic schemes offer a harmonious yet visually striking contrast. They appear vibrant, even if the individual hues lack vibrancy.
Many artists prefer using triadic color schemes in their work. Compared to complementary schemes, triadic ones make it simpler for artists to achieve visually appealing results.

The Airtable logo uses a triadic color harmony—red-purple, yellow-orange, and blue-green.
© Airtable, Fair Use
Split-complementary

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In split-complementary color schemes, designers blend the principles of complementary and analogous colors. They select the complementary color to their primary and then include the adjacent colors on the color wheel.
This approach moderates the often bold or harsh effect of using complementary colors alone, making it easier on the viewer's eye.

Tide uses a blue-purple, yellow, and orange split complementary color scheme. The blue has a lower intensity contrast against the two other colors compared to a blue-purple and yellow-orange complementary color scheme.
© Tide, Fair Use
Tetradic

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The tetradic color scheme includes two complementary color pairs. This scheme can produce vibrant visuals, yet designers find it challenging to achieve balance.
In a tetradic scheme, designers must choose a dominant color, ensuring it doesn't overpower the others and cause imbalance. If designers use equal amounts of each color, it can result in an unappealing appearance, which they aim to avoid.

The Google logo uses a tetradic color harmony.
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Square (A Variant of Tetradic)

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In the square scheme, a variant of the tetradic scheme, designers select four colors by positioning a square on the color wheel. These colors offer a balanced palette when spaced equally at 90° intervals. The design typically looks best when the designer incorporates all four colors uniformly.
Color Harmony: Key Considerations
Depending on what a design is for, who will be using it, and where it will be used, designers must consider several factors when creating color harmony.
Established Color Schemes
Brands employ defined colors to resonate with their audience, emanate their brand persona, and enhance recall value. Therefore, established brands may limit designers' choice of color based on existing brand color schemes.
For example, Coca-Cola relies heavily on red and white, a monochromatic color harmony. The vibrant red symbolizes energy and passion, while the pure white offers balance. This color harmony represents Coca-Cola’s dynamic yet universal appeal.
Designers working with Coca-Cola must consider the brand color scheme in their work.

The Coca-Cola website uses the brand’s red and white color scheme for its primary colors. The cookies and accessibility widgets also use this color scheme. The headline image introduces additional colors as part of Coca-Cola’s holiday campaign. Green is one of the colors used, which forms a complementary color harmony with red.
© Coca-Cola, Fair Use
Color Symbolism
Our relationship with color is complex and rooted in biological, cultural and personal associations. Designers must use research and investigate cultural values to create good designs.
Every color carries different symbolisms that should inform color choices. While designers may choose a specific color to evoke certain feelings in users, all our experiences differ. Yellow may make one person feel happy while representing danger to another. That said, here are some common color symbolisms in Western cultures:
Red: Love, Passion, Strength, Power, Danger, Excitement, Energy.
Orange: Warmth, Creativity, Adventure, Freshness, Happiness, Attraction, Success.
Yellow: Optimism, Cheer, Happiness, Warmth, Caution, Energy, Intellect.
Green: Nature, Growth, Wealth, Luck, Envy, Freshness, Quality.
Blue: Trust, Calm, Sadness, Peace, Loyalty, Depth, Authenticity.
Purple: Royalty, Nobility, Wisdom, Luxury, Imagination, Mystery, Spirituality.
White: Purity, Simplicity, Innocence, Peace, Cleanliness, Emptiness, Goodness.
Black: Sophistication, Formality, Sorrow, Boldness, Elegance, Death, Mystery.

Designers commonly use the blue and orange color scheme to create a complementary harmony. However, while a blue/orange scheme can symbolize trust and warmth, it can also symbolize sadness and success. For this reason, designers always test their color schemes with their target users. This testing ensures their chosen color scheme pleases their users instead of repelling them.
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Cultural Influence
Designers must consider the significance of colors in different cultures. The perception of colors can vary depending on the region where their users are and the customs of that region.
For example, in the 1950s, Pepsi changed the color of its vending machines in Southeast Asia from royal blue to light blue. In this region, the designers did not realize light blue is associated with death and mourning. As a result, Pepsi saw a notable decrease in sales.
Color Blindness
Color blindness affects a considerable portion of the population and presents unique challenges. Forms of color blindness include:
Protanomaly and deuteranomaly: certain shades of green look more red, and vice versa.
Protanopia and deuteranopia: unable to tell the difference between red and green.
Tritanomaly: it’s difficult to tell the difference between blue and green and yellow and red.
Tritanopia: unable to distinguish between blue and green, purple and red, and yellow and pink.

Red and green together create a complementary color scheme. However, people with color blindness perceive these two colors differently. There is very little, or often no, contrast between red and green for people with protanopia and deuteranopia. On the other hand, blue and yellow-orange, and yellow and purple complementary color schemes retain contrast for users with protanopia, deuteranopia, and tritanopia.
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If a color scheme primarily relies on colors that color-blind users find challenging, they may miss essential elements. To improve accessibility, designers use:
Colorblind-friendly palettes, such as blue and yellow-orange, and yellow and purple.
Tools that simulate different types of color vision deficiency.
Color should not be the sole indicator of meaning. If color is the only indicator used for error fields in a form, those with color blindness may not recognize the difference. Designers supplement colors with icons, text prompts, and other visual cues. This way, users with color vision deficiency can still understand the information.

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