Colour Blindness Sim
ColourSimulate 8 types of colour vision deficiency on any colour — protanopia, deuteranopia, tritanopia, and more.
How to Use
Enter a colour
Type any colour in hex, RGB, HSL, or any format Colour.parse understands.
Click Simulate
The tool applies 8 CVD simulation matrices to show how the colour appears with each deficiency.
Compare results
See the original colour alongside each simulated version with name and hex code.
Colour vision deficiency types
Protanopia/deuteranopia (red/green blindness) affect ~8% of males. Tritanopia (blue/yellow) is rarer. Protanomaly/deuteranomaly/tritanomaly are milder forms with reduced sensitivity. Achromatopsia is complete colour blindness; achromatomaly is partial. Designing with CVD in mind means using contrast, texture, and labels — not just colour — to convey information.
About Colour Blindness Sim
Colour choices that look distinct to you can be indistinguishable to the roughly 8% of men and 0.5% of women with colour vision deficiency. ILikePdf Colour Blindness Sim shows how any colour appears under eight different deficiency types, side by side with the original. Use it to audit charts, maps, and interfaces so information never relies on colour alone. The simulation runs locally and instantly, making accessible colour design a habit rather than an afterthought.
How to simulate colour blindness Colour Blindness Sim
Common use cases for Colour Blindness Sim
- Check that charts are readable for colour-blind users.
- Audit brand colours for contrast beyond hue.
- Design colour-blind-safe data visualizations.
- Understand how users with CVD perceive your UI.
Pro tips
- About 8% of men have some form of colour vision deficiency.
- Never rely on colour alone — pair with shapes or labels.
- The simulation runs locally and instantly.