Color Chart for Color Blind
Build and test chart color schemes against all four types of color vision deficiency. Make sure your data visualizations, graphs, and charts are readable by everyone — not just people with normal color vision.
Chart Segments
Original (Normal Vision)
Your chart as you see it — trichromatic, all cone types
Deuteranopia
Green-blind (~6% of males)
Protanopia
Red-blind (~2% of males)
Tritanopia
Blue-blind (rare)
Achromatopsia
Total color blindness
A color chart for color blind users must work across all four CVD types. This tool lets you build charts with custom colors and instantly see them through the eyes of deuteranopia, protanopia, tritanopia, and achromatopsia. For pre-built CVD-safe palettes, try our color blind palette generator. For individual color testing, use the color blindness simulator.
Frequently Asked Questions
How do I pick chart colors that work for color blindness?▼
The safest approach is to use a proven color-blind-safe palette like Color Brewer (orange, sky blue, bluish green, yellow, blue, vermilion, reddish purple). These 7 colors remain distinct under deuteranopia, protanopia, and tritanopia. Use this tool to build a chart with your chosen colors and verify they stay distinguishable in all four CVD simulation views.
What types of charts can I test with this tool?▼
This tool supports pie charts and donut charts — two of the most common chart types that rely on color distinction. You can add up to 10 segments with custom colors, then toggle between all four color blindness simulation views to spot when two segments become indistinguishable.
What should I do if my chart colors fail for color-blind users?▼
Three fixes, in order: (1) swap failing colors for ones from a proven CVD-safe palette, (2) increase lightness contrast between adjacent segments so they differ even without hue, (3) add direct labels, patterns, or textures to each segment so color is never the only differentiator.
How many colors can I safely use in one chart?▼
Limit charts to 5–7 colors from an accessible palette. Beyond 7, even people with normal color vision struggle to distinguish segments. If your data demands more categories, consider splitting into multiple smaller charts or using a bar chart with direct labels instead.