Chart colour-blindness checker
Enter the colours of your chart and see how they look to readers with red-green or blue-yellow colour blindness.
Your data does not go to our server. This tool runs in your browser; what you type or open never leaves your device.
This tool needs JavaScript, because it works in your browser and sends nothing. Turn JavaScript on to use it. How it works is explained below.
- Colours that look alike
How it works
About 1 in 12 men and 1 in 200 women have a colour vision deficiency. The simulation is an approximation of the full deficiency; partial types are milder.
Sources
These tools support writing; they do not replace the Instructions for Authors or the advice of your co-authors and institution.
Questions
How does the simulation work?
The colours are converted with published matrices (Machado et al., 2009) for the three common types, and the colour difference between each pair is measured.
What should I do about a flagged pair?
Change one colour in lightness, not only in hue, or add patterns, labels or different line styles.