Simulate your colors
| Original | Protanomaly (red-weak) | Deuteranomaly (green-weak) | Tritanomaly (blue-weak) | Remove |
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This is body text rendered with your chosen foreground and background colors, simulated for the selected vision type. If the text becomes hard to read here, it will be hard to read for roughly one in twelve male visitors.
Simulation uses color-vision-deficiency transforms applied in linear RGB space using the physiologically-based severity matrices of Machado, Oliveira & Fernandes (2009), with interpolation between severity levels. For hard WCAG numbers on a specific pair, use our contrast checker; for a full accessible palette, try the palette generator. To check an entire live page, run the free Accessibility Scanner.
What the three types mean
- Protanomaly — reds look darker and can vanish against green or grey.
- Deuteranomaly — the most common form; red and green become nearly indistinguishable.
- Tritanomaly — very rare; blue and yellow merge together.
Practical rule: never rely on hue alone to convey meaning. Pair color with icons, labels or patterns — that is also what WCAG SC 1.4.1 requires.
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