Color Blindness Pie Chart — Color Chart Tester
Build a pie or donut chart and see it through the eyes of color-blind users. Spot indistinguishable slices before your audience does — test against deuteranopia, protanopia, tritanopia, and achromatopsia.
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 blindness pie chart tester helps you verify that your data visualizations remain readable for all users. Each type of CVD shifts color perception differently — deuteranopia and protanopia collapse red-green distinctions, tritanopia collapses blue-yellow, and achromatopsia removes all hue. If two slices look identical in any simulation, your chart relies too heavily on color alone. Pair this with our color blind palette generator to build CVD-safe chart colors from scratch, or use the color chart for color blind tool for broader chart testing.
Frequently Asked Questions
What is the Color Blindness Pie Chart tool?▼
This tool lets you build a pie or donut chart with custom-colored segments and instantly see how it looks to people with four types of color vision deficiency (CVD): deuteranopia (green-blind), protanopia (red-blind), tritanopia (blue-blind), and achromatopsia (total color blindness). It helps designers and developers spot when chart colors become indistinguishable for color-blind users.
How do I use this to test my data visualization designs?▼
Add segments that match the colors in your actual charts, then scan all four simulation views. If two segments look identical in any CVD view, your chart relies too heavily on color alone. The fix: add direct labels, use pattern overlays, vary lightness significantly between adjacent slices, or choose a colorblind-friendly palette.
Why do certain colors look identical under color blindness?▼
Each type of CVD shifts or collapses a dimension of color perception along the red-green or blue-yellow axis. Deuteranopia and protanopia both collapse red-green distinctions — reds and greens map to similar yellowish-brown tones. Tritanopia collapses blue-yellow. Achromatopsia removes all hue information, reducing everything to grayscale.
Can I test my own chart colors?▼
Yes — click any segment's color swatch or type a HEX code to match your brand or chart palette. You can add up to 10 segments. Toggle between pie and donut mode to match your actual chart style.
What's the difference between pie and donut mode?▼
Pie mode draws slices from the center outward — the classic pie chart. Donut mode cuts out the center, which many modern dashboards prefer. Both modes apply the same color blindness simulations, so use whichever matches your design. The donut center shows the total segment count.