Colour Blindness Simulator for Directory Sites
Colour Blindness Simulator — optimized for scaled category page rankings and listing visibility.
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Colour Vision Deficiency: Key Facts
Approximately 1 in 12 men have some form of red-green colour vision deficiency.
About 1 in 200 women have red-green CVD due to X-linked recessive inheritance.
Over 300 million people globally live with some form of colour vision deficiency.
Deuteranomaly (weak green) is the most prevalent type, affecting about 5% of all males.
| Type | Category | Prevalence | Affected Colours |
|---|---|---|---|
| Protanopia | Red-blind | ~1.3% of males | No red cones — red appears dark |
| Deuteranopia | Green-blind | ~1.2% of males | No green cones — green-red confusion |
| Tritanopia | Blue-blind | ~0.001% of population | No blue cones — blue-yellow confusion |
| Protanomaly | Red-blind | ~1.3% of males | Weak red cones — reduced red sensitivity |
| Deuteranomaly | Green-blind | ~5% of males | Weak green cones — most common type |
| Tritanomaly | Blue-blind | ~0.01% of population | Weak blue cones — rare |
| Achromatopsia | Monochromacy | ~0.003% of population | Total colour blindness — greyscale only |
How this tool helps for Directory Sites sites
for Directory Sites websites must be accessible to the 300 million people worldwide with colour vision deficiency. This simulator lets for directory sites designers test images and UI elements against 8 CVD types using scientifically accurate matrices, identify indistinguishable colour pairs in their palette, and fix accessibility issues before for directory sites content reaches users.
Directory sites must generate unique value at scale across thousands of category and listing pages while avoiding the thin content penalties that plague low-quality directories. Google scrutinises directories heavily since many add minimal value beyond aggregating data available elsewhere. Success requires enriching listings with unique editorial content, user reviews, and structured data that transforms a simple database into an authoritative resource.
for Directory Sites tips
- Add unique editorial descriptions and category guides to every directory section rather than relying solely on user-submitted or scraped listing data.
- Implement LocalBusiness or Organization schema for each listing to qualify for rich results and provide search engines with structured entity data.
- Build category landing pages with expert-written guides comparing listings to differentiate from competitors and provide genuine value beyond simple aggregation.
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