Colour-Blind-Safe Palette Checker
Check whether the colours in your palette stay distinguishable for people with common forms of colour vision deficiency, so your art, charts and designs stay clear for everyone.
Enter Your Palette
Results
How to Use This Tool
Enter between two and six hex colours from your palette, one per line, then click Check Palette. The tool simulates how your colours appear under protanopia, deuteranopia and tritanopia and flags any pairs that may become difficult to tell apart.
Example
A palette of red, green, blue and yellow often passes for tritanopia but can flag a caution for deuteranopia, since red and green can appear similar under that form of colour vision deficiency. This helps you decide whether to add a shape, label or value difference alongside colour alone.
Why This Matters
Around 1 in 12 men and 1 in 200 women have some form of colour vision deficiency. Checking your palette helps make sure charts, artwork, packaging and designs communicate clearly to as many people as possible.
What to Do If a Pair Fails
If two colours are flagged as hard to distinguish, try increasing the difference in lightness or saturation between them, or add a non-colour cue such as a pattern, label or icon so the information does not rely on colour alone.
Frequently Asked Questions
What does this tool do?
It checks whether the colours in your palette remain distinguishable from each other under three common forms of colour vision deficiency.
How many colours can I check at once?
You can check between two and six colours at a time.
What is the difference between this and the Colour Blindness Simulator?
The Colour Blindness Simulator shows how one single colour looks under colour vision deficiency, while this tool checks whether multiple colours in a palette stay distinguishable from each other.
What types of colour vision deficiency does this check?
It checks protanopia, deuteranopia and tritanopia, three of the most common forms of colour vision deficiency.
What should I do if my palette fails a check?
Try increasing the lightness or saturation difference between the flagged colours, or add a non-colour cue such as a pattern or label.
Is a Pass result a guarantee of accessibility?
It is a strong indicator based on simulated colour distance, but real-world perception can still vary between individuals, so use it as guidance rather than a certification.
How common is colour vision deficiency?
It affects roughly 1 in 12 men and 1 in 200 women worldwide, most commonly as red-green colour vision deficiency.
Is this tool free to use?
Yes, this tool is completely free to use with no sign-up required.
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