ChromaSim Color Blindness Simulator

This color blindness simulator covers the most common and significant forms of dyschromatopsia, helping you understand the different perceptions of colors.

• Protanopia: Characterized by a severe insensitivity to red. Red tones appear dark and are often confused with greens, influencing the perception of a wide range of shades.
• Deuteranopia: Insensitivity to green. People with deuteranopia find it very difficult to distinguish between reds and greens, which appear extremely similar or confused.
• Tritanopia: Rare insensitivity to blue. This condition distorts the perception of blue and yellow colors, which can appear tending towards green or pink.
• Achromatopsia: The most severe form of color blindness, where vision is completely in grayscale. All colors are perceived as neutral tones of white, black, and gray.

Using our online color blindness test is simple and intuitive:

1. Insert the direct URL of the image you wish to analyze in the appropriate field (e.g., https://yoursite.com/image.jpg). Make sure it is a direct link to the image file.
2. Click the “Upload image” button. The tool will process the image and prepare it for simulation.
3. Use the “Select color blindness type” dropdown menu to choose which filter to apply. You will see the original and the transformed image side by side.
4. Click on one of the images to enlarge it and analyze the details.
5. Use the “Download” button below each image to save the simulated version to your device in PNG format.

Remember that the tool requires Access-Control-Allow-Origin (CORS) permission from the image's server to be able to manipulate it. Without this permission, loading might fail.

This color blindness simulator is a valuable resource for anyone involved in creating visual and digital content, aiming to improve web accessibility and inclusive design:

• UI/UX Designers: To test the visual accessibility of user interfaces and ensure an optimal experience for all users.
• Front-end Developers: To create web interfaces that are usable and understandable even for people with color blindness.
• Digital Accessibility Teams: An excellent tool for visual audits and for training staff on the importance of color considerations.
• Graphic Designers and Marketers: To ensure that logos, advertising materials, and graphics are effective and do not create barriers for a segment of the audience.
• Educators, Students, and Visual Communicators: To understand and teach the impact of color blindness on visual perception.

Creating inclusive design is essential. Here are some tips to make your digital and graphic content accessible even for people with color blindness:

• Don't Rely Solely on Color: Color should not be the only way to convey information. Also use patterns, icons, text, or different shapes to indicate states, actions, or categories (e.g., a red error field should also have an 'X' icon or a text message).
• Ensure High Contrast: Make sure there is sufficient contrast between text and its background, and between important graphic elements. Contrast checkers (often based on WCAG) can help you.
• Choose Color-Friendly Palettes: Prefer color combinations that are distinguishable even with various types of color blindness. Avoid using red and green, or blue and yellow, together without alternative visual support.
• Use Clear Labels and Legends: For charts, maps, or infographics, ensure that each colored section has a textual label or a clear legend to identify the element without relying solely on color.
• Test with a Color Blindness Simulator: Regularly use tools like this simulator to see how your designs appear to different people. It's the most effective way to identify and correct potential usability issues.

By implementing these tips, you will contribute to making the web and visual content a more equitable and usable place for everyone.

It's important to remember that a color blindness simulator offers an approximate representation of dyschromatic vision, not an exact reproduction. Every individual is unique, and color perception can vary even within the same type of color blindness.

• Not a Diagnosis: This tool is not a medical test and cannot diagnose color blindness. It is purely for simulation purposes for design and accessibility.
• Complexity of Real Vision: Human vision is complex and influenced by many factors (brightness, environment, screen illumination). Filters simulate chromatic changes, but cannot fully replicate the subjective visual experience.
• CORS Dependency: The ability to load and process external images depends on the CORS permissions of the server hosting the image.

Despite these limitations, our simulator remains a very powerful and indispensable tool for developers and designers who want to create more inclusive digital experiences.