How to Design for Color Blindness

Imagine launching a new product page with a bright green "Add to Cart" button only to discover that millions of potential customers can't distinguish it from the surrounding content. For roughly 1 in 12 men and 1 in 200 women worldwide, this is the reality of navigating the web with color vision deficiency (CVD), more commonly known as color blindness.

Designing for color blindness means building digital experiences that remain fully usable and understandable for people who perceive color differently. It's a core principle of inclusive design, and it's addressed directly in the Web Content Accessibility Guidelines (WCAG(opens in a new tab))(opens in a new tab) under Success Criterion 1.4.1: Use of Color(opens in a new tab). 

An important call out: color blindness is not the same as low contrast: a design can pass every contrast ratio test and still fail a color-blind user if color is the only signal conveying meaning.

Done right, inclusive color design doesn’t limit creativity. It simply layers in redundant cues and clear visual hierarchies that improve usability for everyone, including the estimated 300 million people worldwide living with CVD.

1. Don’t Rely on Color Alone 

This is the most fundamental rule. If color is the only way you're communicating something, a required field marked in red, a chart using color-coded lines with no labels, a navigation link distinguished only by hue, then a portion of your users will miss the message entirely. Every instance where color carries meaning should be paired with at least one additional visual indicator.

2. Ensure Sufficient Contrast 

The WCAG 2.2 guidelines set clear minimum contrast ratios: 4.5:1 for standard body text and 3:1 for large text (18pt or 14pt bold and above). These thresholds exist because people with color vision deficiencies often experience reduced contrast sensitivity alongside their difficulty distinguishing hues. Meeting contrast requirements supports readability for the broadest possible range of users.

3. Provide Redundant Visual Cues 

Icons, text labels, patterns, underlines, shapes — these are the safety nets that catch users when color fails them. A well-designed form doesn't just turn an input border red when there's an error. It also adds an error icon, displays a descriptive message, and ideally uses a visual cue, such as bolding or a shape change, to draw attention.

4. Maintain Visual Hierarchy and Clarity

Aolor-blind-friendly website isn't just about swapping palettes. It's about ensuring that your layout, typography, spacing, and element sizing create a clear hierarchy that functions independently of color. When structure and contrast do the heavy lifting, color becomes an enhancement rather than a dependency.

Check Your Color Contrast

Color contrast makes the difference between a website that's navigable and one that isn't. Without enough contrast between text, backgrounds, and interactive elements, colorblind users may struggle to distinguish one element from another.

Under WCAG 2.2, contrast is addressed primarily through two success criteria:

• Success Criterion 1.4.1 (Use of Color): Color cannot be the sole means of conveying information, indicating an action, prompting a response, or distinguishing a visual element.

• Success Criterion 1.4.3 (Contrast – Minimum): Text and images of text must have a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. This is the AA standard — the level most organizations target for compliance.

Level AAA raises the bar further, requiring a 7:1 ratio for normal text and 4.5:1 for large text. While AAA represents the highest standard, it's best understood as a contextual benchmark rather than a blanket design constraint. Some pages or components may meet AAA easily; others may not — and that's expected.

It's worth noting that meeting contrast ratios alone does not guarantee a color-blind friendly experience. A design can pass every contrast check and still rely on color in ways that make it unusable for someone with red-green or blue-yellow deficiency. Contrast compliance and color-blind usability are related, but they're not the same thing.

To see where your current contrast levels stand, try AudioEye's color contrast checker.

8 Best Practices for Color Blind Friendly Websites

1. Don’t Rely on Color Alone (WCAG 1.4.1)

This is arguably the most fundamental rule in color-blind-friendly design, and the one most often overlooked. Wherever color is carrying meaning, a required field marked in red, a status indicator, a chart relying on color-coded lines, a portion of your users will miss it without a second cue.

Pair color with an icon, a text label, a pattern, or a shape change, and the message gets through regardless of how someone perceives color. This applies to any visual communication: form validation, alerts, navigation, visualizations, and notifications.

2. Use Icons and Symbols (WCAG SC 1.4.1: Use of Color)

Icons and symbols are one of the most reliable ways to supplement color as a communicative cue. Universal icons, like an exclamation point paired with a red outline on a form field error, ensure the message lands regardless of how the user perceives color.

A sample bar chart where each column has a different pattern.

3. Use Textures and Patterns (WCAG SC 1.1.1: Non-text Content)

When you need to emphasize certain objects, it’s a good idea to incorporate textures and/or patterns. This is especially helpful for charts and graphs where color is often used to differentiate between items. Adding textures and patterns like checkers, lines, and dots can help make each item stand out as unique and easily identifiable. 

For example, if you’re including a map with different types of terrain, consider using different textures (like striped, dotted, crosshatched, etc.) alongside color. This helps to differentiate between various landforms, making it more accessible for individuals who are color blind.

Finally, if you’re going to include charts and graphs on your website, be sure to add alt text for people who cannot perceive items visually.

4. Use Labels

Labels are one of the simplest and most effective ways to improve usability for people who are color blind. Textures and patterns help differentiate visual elements, but adding clear text labels removes ambiguity entirely — and benefits screen reader users too.

Labeling is especially important when items on your site are differentiated primarily by color. If you sell products in multiple colors, for example, labeling each swatch (e.g., "Navy," "Forest Green," "Burgundy") helps users identify options with confidence rather than guessing based on color perception alone.

Labels also reduce cognitive load for all users, removing the need to decode color-matched legends or associations entirely.

5. Go Bold

People with color blindness tend to have an easier time seeing thick and pronounced lines. Avoid using thin slivers of color, and make sure links are bold and pronounced. This will help enhance visual clarity and user focus. For example, using thick, bold lines under call-to-action (CTA) buttons can help users understand what their next steps are, which can decrease confusion and frustration.

Stylized versions of the same web page showing how bold text can help with legibility.

6. Use Color Contrast Properly (WCAG SC 1.4.3: Contrast Minimum)

You can make your website’s components stand out to all users by properly using color contrast in your design. The trick is to use brightness and tone, in addition to hues. If you contrast by color, but maintain the same brightness, elements like look blended or muddled to those with color deficiencies. 

Adjusting brightness and tone is not only a solid practice for color blindness accessibility, but it is best practice for overall UI design as well. You may find that contrasting with brightness and tone, rather than pigmentation, is also more satisfying aesthetically. 

To get a better idea of how you are implementing brightness and tone contrasts on your site, look at it in grayscale.

7. Avoid Certain Color Combinations

Since color blindness affects individuals differently, merely avoiding certain hues is not enough. There are certain color combinations that can cause problems for users who are color blind. Some common combinations to avoid include:

• Green/red

• Green/blue

• Green/black

• Green/brown

• Green/gray

• Light green/yellow

• Blue/purple

• Blue/gray

Whenever possible, you should use a colorblind-friendly palette and accessible colors. However, if you do use any of the color combos above, be sure to provide alternative methods for portraying information such as subtitles, labels, focus elements, or icons.

Stylized versions of the same web page. One version has a lot of different colors, the other version is all blue.

8. Embrace Minimalism

Having different color schemes and hues on your website can seem fun and appealing, but it can also be confusing and frustrating for people who are color blind. You can still have fun by sticking to a palette and using gradations, brightness, and tone. 

In addition to improving your site's accessibility for people with color deficiencies, a minimalist design can also make your site look sleeker, more professional, and aesthetically pleasing. Limiting your palette also reduces the risk of relying on problematic color combinations, making accessibility easier to maintain as your site grows.

Why Color Blindness Website Accessibility Matters

Designing for color blindness is, at its core, good design. Sites built with color-blind users in mind tend to have clearer visual hierarchies, more readable layouts, and stronger information architecture. These are qualities that improve the experience for every visitor, not just those with color vision deficiency.

There's also a broader reach benefit. When your site is more usable, more people can engage with your content, complete purchases, fill out forms, and take the actions your site is designed to support. Removing unnecessary color barriers opens the door to more customers and stronger engagement.

From a compliance standpoint, accessible color use aligns with standards like the ADA in the United States and the AODA in Canada, both of which reference WCAG guidelines as the benchmark for digital accessibility. Designing proactively reduces legal risk, but the bigger win is building a site that works for everyone from the start.

Testing Your Design

As you’re designing your website, be sure to build regular contrast testing into your process; avoid treating it as a final check. A color contrast checker is a practical starting point. It gives you a clear picture of where your existing contrast levels fall short and where improvements are needed. 

However, contrast is just one dimension of color-blind friendly design. Running your designs through color blindness simulation tools, which approximate how pages appear to users with protanopia, deuteranopia, and other CVD types, helps catch issues that contrast testing alone won't surface. Additionally, involve users with color vision deficiencies in the testing process. This gives you authentic feedback on how color-blind-friendly and accessible your content is.

Build Color-Blind Friendly Designs with AudioEye

Good color-blind-friendly design is the result of deliberate decisions made early and tested often. Knowing the rules and catching every instance where color is doing too much work across a full site are two different challenges — and that gap is where most teams struggle.

AudioEye’s Color Contrast Checker lets you test color combinations against WCAG standards before they become production problems. To further enhance accessibility, AudioEye’s Accessibility Platform helps you find and fix a broader range of issues, helping you create digital content that’s usable by all. 

Ready to test your color combinations? Use our Color Contrast Checker.