Color Blindness Simulator
Simulate protanopia, deuteranopia, or tritanopia for one color. See how colorblind people perceive your design. Browser-local, no upload, free.
Runs locally in your browser. Your input is not uploaded to DevToolMate servers.
Developer Quick Tips
- Enter a color in HEX, RGB, or HSL and pick protanopia, deuteranopia, or tritanopia to instantly preview how it appears under each type.
- Output includes HEX, RGB, HSL, HSV, and OKLCH for both original and simulated colors; copy any format into your design or code.
- Test brand colors and UI accents side-by-side to verify accessibility before shipping; all processing stays in your browser.
- Use the matrix transform to check whether critical UI elements remain distinguishable under common color blindness types.
Frequently asked questions
What do colorblind people see and how does this simulator show it?
People with protanopia see reds and greens as similar brownish or yellowish shades. Deuteranopia causes similar confusion with different hue shifts. Tritanopia affects blue and yellow perception. This simulator uses a matrix transform to shift your input color's linear RGB values, showing how it may appear under each type. Enter a color, pick a type, and preview the simulated swatch instantly in your browser.
What is the difference between protanopia and deuteranopia?
Protanopia involves loss of red-sensitive cones; deuteranopia involves loss of green-sensitive cones. Both are red-green color blindness but shift colors differently. Protanopia typically makes reds appear dark or brownish; deuteranopia makes greens appear brownish. This simulator lets you test both side-by-side to see which colors remain distinguishable under each type.
How do I use the color blindness simulator to test my design?
Enter a single color in HEX, RGB, or HSL format. Select protanopia, deuteranopia, or tritanopia. The simulator displays the original and simulated swatches side-by-side with output in HEX, RGB, HSL, HSV, and OKLCH. Test your brand colors and UI accents one at a time to verify accessibility compliance before shipping. All processing runs locally in your browser.
Can I test my entire website or image with this color blindness simulator?
No. This tool simulates one color at a time using a matrix transform. For full-page or image simulation, use dedicated browser extensions or accessibility checkers. This simulator is best for checking individual accent colors, brand swatches, or UI elements before design handoff.
Does the color blindness simulator upload my color input to servers?
No. All processing happens locally in your browser. Your color input is never uploaded to DevToolMate servers. Close the tab and your input is cleared from memory.
Is the color blindness simulator free and do I need an account?
Yes. Completely free, no account required, no ads. The tool runs on your device. Test as many colors as you need.
Related tools
- Random Accessible Palette: Generate random accessible color palettes with WCAG contrast checks. HEX, RGB, HSL, HSV, OKLCH formats. Browser-local, no upload.
- Color Converter: Free hex to rgba converter: Convert HEX, RGB, HSL, HSV, and approximate OKLCH instantly in your browser. No upload, no account, no data stored.