Color Blindness Simulator Online - Test Accessibility
Upload an image or enter colors to see how they appear under different types of color vision deficiency. Test for protanopia, deuteranopia, tritanopia, and achromatopsia.
Color Blindness Simulator
See how colors appear to people with color vision deficiency
Simulation Results
Protanopia
No red cones - reds appear dark, red-green confusion
Original
Simulated
Per-color breakdown
Shift: 180 (significant)
Shift: 152 (significant)
Shift: 81 (significant)
About Color Vision Deficiency
Protanomaly
(L-cones (red))Reduced red cone sensitivity - weakened red perception
Affects: ~1% of males, 0.01% of females
Protanopia
(L-cones (red))No red cones - reds appear dark, red-green confusion
Affects: ~1.01% of males, 0.02% of females
Deuteranomaly
(M-cones (green))Reduced green cone sensitivity - most common CVD type
Affects: ~5% of males, 0.35% of females
Deuteranopia
(M-cones (green))No green cones - greens appear beige, red-green confusion
Affects: ~1.27% of males, 0.01% of females
Tritanomaly
(S-cones (blue))Reduced blue cone sensitivity - weakened blue-yellow distinction
Affects: ~0.01% of population
Tritanopia
(S-cones (blue))No blue cones - blues appear greenish, yellow-blue confusion
Affects: ~0.003% of population
Achromatopsia
(All cones)Total color blindness - sees only shades of gray
Affects: ~0.003% of population
Quick Start
- 1Upload an image or enter color values
- 2Select a color blindness type to simulate
- 3Compare the original with the simulated view
- 4Adjust your design for better accessibility
More Check Tools
All checkers →Check What My IP Address Is Online
See your public IP plus city, country, timezone, and ISP. Free IP lookup useful for VPN checks and network troubleshooting.
Check Button and Link Color Contrast Online
Test whether button text and link colors meet WCAG contrast rules. Free online color contrast checker for UI components.
Check MX Records for a Domain
Check the MX records for any domain and verify email delivery configuration. Free MX record lookup with mail server priorities, no signup.
Check SPF and DKIM TXT Records
Look up SPF and DKIM TXT records for any domain to verify email authentication. Free TXT record checker with full record values, no signup.
Check SSL Certificate Expiry Date
Check when an SSL certificate expires and see the days remaining for any domain. Free SSL expiry checker with issuer and validity details.
Check a Web Page for Broken Links and 404s
Scan a web page for broken links and 404 errors across internal and external links. Free broken link checker for SEO, no signup.
Looking for FAQs and advanced options? Visit the full Color Blindness Simulator page →