Color Blindness Simulator

Enter a HEX color and see how it appears under five vision types: normal, protanopia, deuteranopia, tritanopia, and achromatopsia.

Normal

Full color vision (trichromacy)

#3B82F6

Protanopia

Red-blind, no L-cone response (~1% of males)

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Deuteranopia

Green-blind, no M-cone response (~1% of males)

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Tritanopia

Blue-blind, no S-cone response (rare)

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Achromatopsia

Complete color blindness, grayscale only

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Simulations use the Machado et al. (2009) matrix method. Results are approximations for design reference, not clinical assessment.

About this tool

The Color Blindness Simulator is a free color tool. Enter a HEX color and preview how it appears under protanopia, deuteranopia, tritanopia, and achromatopsia for accessible design. Runs directly in the browser with no account required.

Use cases

Enter a HEX color and preview how it appears under protanopia, deuteranopia, tritanopia, and achromatopsia for accessible design.
Copy color blindness simulator output into tickets, docs, QA notes, support replies, or pull request descriptions.
Keep /color-blindness bookmarked as a repeatable color utility for focused, copy-friendly work.
Validate a quick color answer before turning it into a spreadsheet formula, command-line snippet, or one-off script.

FAQ

What is the Color Blindness Simulator used for?

Enter a HEX color and preview how it appears under protanopia, deuteranopia, tritanopia, and achromatopsia for accessible design. It runs directly in your browser with no account required.

How do I use the Color Blindness Simulator?

Open /color-blindness, review the page output, and copy the generated result into your docs, tests, support notes, or debugging workflow.

Does the Color Blindness Simulator have an API?

This page is designed as a browser utility. Use the copy-friendly output when you need to move results into another workflow.

Who is the Color Blindness Simulator for?

The Color Blindness Simulator is useful for developers, QA teams, support teams, operators, and content teams that need reliable color output without opening a heavier application.