About the Color Blindness Simulator
Check charts, maps, designs and photos for color-blind accessibility. Your image is shown as people with the main types of color vision deficiency see it, using the Machado (2009) model, right in your browser.
Key features
- Deuteranopia, protanopia, tritanopia
- Achromatopsia (no color)
- All views side by side
- Scientific Machado 2009 model
- Download each simulation
- Images never uploaded
See your design through other eyes
Charts, maps, status badges and games often rely on red versus green, which millions of people can't tell apart. Upload a screenshot or image to see how it looks with each main type of color vision deficiency.
Types of color blindness
| Type | Missing | Confuses | How common |
|---|---|---|---|
| Deuteranopia | Green cones | Red–green, brown–green | ~1% of men (plus ~5% milder) |
| Protanopia | Red cones | Red–green; red looks dark | ~1% of men (plus ~1% milder) |
| Tritanopia | Blue cones | Blue–green, yellow–pink | Rare (~0.01%) |
| Achromatopsia | All color | Sees only lightness | Very rare (~0.003%) |
Quick accessibility checks
- Can you still tell every line in a chart apart?
- Are error and success messages clear without their color?
- Do links stand out from body text without relying on color alone?
Related tools
Contrast checker, color palette generator and image color picker.
How to use the Color Blindness Simulator
- Drop an image onto the box, or click Try a sample image.
- See it as people with deuteranopia, protanopia, tritanopia and achromatopsia see it, side by side.
- Pick one view to see it larger.
- Download any simulation as a PNG. Your image never leaves your device.