Adjustments
Color Blindness Simulation
Simulate how images appear to people with different types of color vision deficiency, including protanopia, deuteranopia, tritanopia, and achromatopsia. Essential for accessibility testing of UI designs, infographics, and data visualizations.
Features
- Simulates 8 types of color vision deficiency
- Protanopia, deuteranopia, tritanopia, and achromatopsia
- Side-by-side comparison with original
- Batch test across multiple screenshots
- WCAG accessibility context for each deficiency type
What you can do
- Test UI designs for accessibility before shipping to production
- Verify data visualizations are readable for color-blind users
- Check that color-coded maps and charts remain distinguishable
- Audit marketing materials for inclusive color usage
Self-hosted. Your images never leave your network.
SnapOtter runs entirely on your own infrastructure. Images processed with Color Blindness Simulation are never uploaded to third-party servers. Deploy a single Docker container and process images with full privacy, no watermarks, and no usage limits. Open source under AGPL-3.0.
Frequently asked questions
- What percentage of people are color blind?
- About 8% of men and 0.5% of women have some form of color vision deficiency. The most common types are red-green (protanopia and deuteranopia), affecting roughly 1 in 12 men.
- How do I make my designs accessible for color blind users?
- Never rely on color alone to convey information. Use shapes, patterns, labels, or icons alongside color. Test with a simulator like this to verify your designs remain clear under all deficiency types.
- What is the difference between protanopia and deuteranopia?
- Both are red-green color blindness. Protanopia reduces sensitivity to red light, making reds appear darker. Deuteranopia reduces sensitivity to green light. Both make red and green hard to distinguish, but in slightly different ways.
Ready to try Color Blindness Simulation?
Deploy SnapOtter in under a minute. All 50+ tools included. Open source and free forever.