Is Color Blindness Simulator free?

Yes, Color Blindness Simulator is completely free to use. There is no signup required, no file size limits for most tools, and no watermarks on output.

Is my data safe when using Color Blindness Simulator?

Yes. Color Blindness Simulator runs entirely in your browser. No files or data are uploaded to any server, ensuring complete privacy and security.

Color Blindness Simulator

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What is Color Blindness Simulator?

Color Blindness Simulator shows how your designs appear to people with different types of color vision deficiency, including deuteranopia, protanopia, tritanopia, and achromatopsia.

When to use this tool

Testing UI designs for color accessibility
Ensuring data visualizations are readable by all users
Verifying color-coded information isn't lost for color-blind users
Meeting WCAG accessibility requirements for color usage

How it works

Applies mathematical color transformation matrices to each pixel of the input image or color palette. Each deficiency type has a specific matrix that remaps RGB values to simulate how the eye's cone cells respond with reduced or absent sensitivity.

Examples

Green/Red test

Input: #FF0000 and #00FF00

Output: Both colors appear as similar brownish-yellow in deuteranopia

About Color Blindness Simulator

Preview how colors appear to color-blind users It runs entirely in your browser — no files are uploaded to any server, ensuring complete privacy and instant results.

•Test and debug regular expressions
•Parse cron expressions in plain English
•Format SQL, XML, and YAML
•Convert between number bases instantly

Last updated: 2025-01-15

FAQ

Preview how colors appear to color-blind users

Yes, completely free. No signup required.

Yes. Runs entirely in your browser, no files uploaded.

Yes, works on any device with a modern browser.

No, everything runs in your browser.