Visual Entity Probe
Primary Node
Adjust vector to cascade maps.
OR
Degraded Perception Maps
Normative Plane
Baseline rendering
Protanopia
Red vector collapse
Deuteranopia
Green vector collapse
Tritanopia
Blue vector collapse
Achromatopsia
Complete chromatic failure

Color Blindness Simulator: Accessibility Testing

Over 300 million people worldwide experience some form of Color Vision Deficiency (CVD), commonly known as color blindness. If you are designing a website, a mobile app, or a data visualization chart, relying exclusively on color to convey critical information (like marking an error message entirely in red) means a significant portion of your users will be unable to understand it.

Our free online Color Blindness Simulator allows UI/UX designers and developers to instantly test their visual assets for accessibility. By uploading an image or selecting a primary color node, the tool generates real-time degraded perception maps, showing you exactly how your design appears to users with different types of color blindness.

Understanding the Perception Maps

Human eyes contain three types of color-detecting cones: Red, Green, and Blue. Color blindness occurs when one or more of these cones are absent or malfunctioning. Our SVG rendering matrix simulates the four most common deficiency types:

  • Protanopia (Red-Blind): A complete absence of red retinal photoreceptors. Reds appear as dark brown or black, and certain shades of orange, yellow, and green all look identical.
  • Deuteranopia (Green-Blind): The most common form of color blindness. Users have no green cones, making it extremely difficult to distinguish between red, green, brown, and orange.
  • Tritanopia (Blue-Blind): A rare condition where the blue cones are missing. Users confuse blue with green, and yellow with violet.
  • Achromatopsia (Total Monochromacy): The complete inability to see any color. The world is viewed entirely in shades of gray, black, and white.

Frequently Asked Questions (FAQs)

How do I make my designs more accessible?
Never use color as the only method of conveying information. If you have a green "Success" button and a red "Error" button, add distinct icons (like a checkmark and an X) or clear text labels to differentiate them, because they may look identical to a user with Deuteranopia.
Are my uploaded images stored on your server?
No. The simulation utilizes native SVG <feColorMatrix> filters applied directly inside your browser. When you "sideload" an image, it is read locally. Your proprietary UI mockups are never uploaded to the internet.

Audit Your Accessibility

Stop guessing if your designs are inclusive. Scroll up, upload your mockup, and see it through your users' eyes.