The Color Blindness Simulator helps designers review color choices through the lens of color vision deficiency. Select a base color and choose a simulation type to see how it appears to users with protanopia, deuteranopia, tritanopia, or achromatopsia.
This tool is essential for designing accessible interfaces. About 8% of males and 0.5% of females are affected by color blindness. Ensuring sufficient contrast and avoiding color-only information makes your design inclusive.
Frequently Asked Questions
Q: What is the difference between protanopia and deuteranopia?
What is the difference between protanopia and deuteranopia? Protanopia is red-blindness where red cones are missing. Deuteranopia is green-blindness where green cones are missing. Both affect red-green color discrimination.
Q: How accurate is this simulation?
How accurate is this simulation? This uses industry-standard Daltonization algorithms based on the LMS color space. It provides a reasonable approximation of how colors appear to color-blind users.
Q: What is the most common type of color blindness?
What is the most common type of color blindness? Deuteranopia (green-blind) affects approximately 6% of males, making it the most common form. Protanopia (red-blind) affects about 2%. Always test for both types.
Q: Can color blind users see blue and yellow?
Can color blind users see blue and yellow? Yes, most forms of color blindness preserve blue-yellow discrimination. Designing with blue and yellow as key differentiators is an accessible color strategy.
Q: How does this tool help with UI design?
How does this tool help with UI design? Use it to check if your error states (typically red) are distinguishable from success states (green) for all users. Also verify that charts and data visualizations use patterns or labels alongside color.
CSS Named Colors & Color Psychology
The web has 148 named colors built into CSS, from Coral to Goldenrod. Beyond the code, color psychology shapes how users feel about interfaces — warm tones energize, cool tones calm, and neutrals build trust. This palette mixes CSS classics with the psychology behind them.
Coral #FF7F50Warm and friendly — popular for CTAs in lifestyle brands
Tomato #FF6347Energetic red-orange, great for urgent accents
Goldenrod #DAA520Earthy gold associated with quality and heritage
Teal #008080Balanced blue-green — calm, trustworthy, professional
Indigo #4B0082Deep violet tied to wisdom and premium brands
Crimson #DC143CBold red for passion, alerts, and strong emphasis
SlateBlue #6A5ACDSoft purple-blue common in SaaS dashboards
ForestGreen #228B22Nature and growth — the color of eco and finance brands
HotPink #FF69B4Playful and bold, the signature of youth-oriented design
Navy #000080Authority and stability — the suit-and-tie of colors
Q: What are CSS named colors?
What are CSS named colors? CSS defines 148 named colors like Coral and Goldenrod that work in any stylesheet without hex codes. They are great for prototyping but designers usually switch to hex or HSL for precise brand colors.
Q: How does color psychology affect design?
How does color psychology affect design? Warm colors (red, orange, yellow) create energy and urgency; cool colors (blue, green, teal) create calm and trust. CTAs often use warm tones while financial and health brands prefer blues and greens.