Colour Blindness Simulator
Preview how a colour pair looks with different types of colour blindness
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About Colour Blindness Simulator
See Your Design Through the Eyes of Colour Blind Users
Approximately 8 percent of men and 0.5 percent of women have some form of colour vision deficiency. If your design relies on colour alone to convey information, a significant portion of your audience may be unable to use it effectively. The Colour Blindness Simulator on ToolWard shows you exactly how your colours appear under different types of colour blindness, so you can design for everyone.
How the Colour Blindness Simulator Works
Enter a colour using a hex code, RGB values, or the colour picker. The tool renders that colour as it would appear to someone with protanopia (red-blind), deuteranopia (green-blind), tritanopia (blue-blind), and achromatopsia (total colour blindness). You can also upload an image or screenshot to see the full simulated view. Side-by-side comparisons make differences immediately apparent.
Why Colour Blindness Simulation Matters
Accessibility is not optional. It is a legal requirement in many jurisdictions and an ethical responsibility in all of them. Beyond compliance, accessible design simply serves more people. A chart that uses red and green to distinguish data series becomes unreadable for protanopic and deuteranopic users. A form that highlights errors only in colour leaves colour blind users confused. The Colour Blindness Simulator catches these issues before your design goes live.
Who Uses This Tool?
UI and UX designers checking colour palettes during the design phase. Front-end developers verifying that interfaces meet WCAG accessibility guidelines. Data visualisation specialists ensuring charts and graphs are readable by all viewers. Game designers testing that gameplay cues are not colour-dependent. Marketing teams reviewing branded materials for inclusivity. If your work involves colour, this tool deserves a place in your workflow.
Tips for Accessible Colour Design
Never rely on colour alone to convey meaning. Pair colours with labels, icons, or patterns. Use tools like this simulator early in the design process, not as an afterthought. Choose colour palettes that maintain contrast across all vision types. Blues and oranges tend to be safer than reds and greens. The Colour Blindness Simulator helps you make informed choices before committing to a palette.
Private and Instant
The tool processes everything in your browser. No images or colour data are uploaded to any server. Results are instant and visual. Bookmark this tool and run every colour decision through it before finalising your design.