Color Blindness Simulator & Checker
مرشد
Color Blindness Simulator & Checker
See how your images and color palettes look to people with color vision deficiency. Simulate 8 types of CVD and test your designs for WCAG contrast compliance to ensure accessibility for all users.
كيف تستعمل
Upload an image or enter color values to simulate. Select a color vision deficiency type to see how your design appears to affected users. Use the contrast checker to verify your color combinations meet WCAG accessibility standards.
سمات
- 8 CVD simulations – Protanopia, Deuteranopia, Tritanopia, Protanomaly, Deuteranomaly, Tritanomaly, Achromatopsia, and Achromatomaly
- Image simulation – Upload any image and see it through different CVD perspectives
- Color palette testing – Check how individual colors and palettes appear under each type
- WCAG contrast checker – Verify foreground/background color combinations meet AA and AAA standards
- Side-by-side comparison – Compare original and simulated views
- معالجة جانب العميل – Your images stay in your browser
التعليمات
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What causes color blindness and how common is it?
Color blindness (color vision deficiency) is usually inherited through X-linked recessive genes, which is why it affects roughly 8% of men but only 0.5% of women. The condition occurs when one or more types of cone cells in the retina are absent or dysfunctional. The three cone types respond to red (long), green (medium), and blue (short) wavelengths. Most color blind individuals are not truly 'blind' to color but perceive a reduced range of distinguishable hues.
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What is the difference between protanopia, deuteranopia, and tritanopia?
These are the three types of dichromacy (complete absence of one cone type). Protanopia lacks red-sensitive cones, making reds appear dark and indistinguishable from greens. Deuteranopia lacks green-sensitive cones with similar red-green confusion but without the darkening. Tritanopia lacks blue-sensitive cones, causing blue-yellow confusion. Protanopia and deuteranopia are far more common (affecting ~2% and ~6% of males respectively) while tritanopia is rare (~0.01% of the population).
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Why is designing for color accessibility important?
Approximately 300 million people worldwide have some form of color vision deficiency. If information is conveyed only through color — like red for errors and green for success — these users may miss critical feedback. Accessible design uses multiple cues: icons, patterns, labels, and sufficient contrast alongside color. WCAG guidelines recommend a minimum contrast ratio of 4.5:1 for text and advise never using color as the sole means of conveying information.
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