Color Blindness Simulator
Over 300 million people experience color vision deficiency. Test UI palettes, dashboard components, and upload screenshots to simulate Deuteranopia, Protanopia, Tritanopia, and Achromatopsia.
Select Vision Condition
WCAG 1.4.1 Warning: Color Confusion Detected Under Deuteranopia
Users with this vision condition will have difficulty distinguishing the following pairs without secondary visual cues (icons, borders, or text):
- •"Warning / Pending" (#F59E0B) and "Error / Critical" (#EF4444) appear virtually identical under Deuteranopia (Simulated contrast: 1.19:1). Users may confuse their meaning.
Palette Swatches: Normal vs. Deuteranopia
Direct chromatic shift comparison with real-time WCAG contrast metrics against white and dark backgrounds.
Live Software Component Simulation
Cloud Cluster Deployment
Service telemetry monitoring
Cloud Cluster Deployment
Service telemetry monitoring
Full 360° Color Spectrum Shift
How each primary and secondary hue across the color wheel transforms under Deuteranopia:
Upload Image / Screenshot Simulator
Drop any UI screenshot, Figma export, or photo below. Our browser Canvas applies exact physiological spectral matrices to every pixel instantly with zero server lag.
Click to upload an image or drag & drop screenshot here
Supports PNG, JPG, WebP, SVG • Current: saas-dashboard-mockup.svg
Designing Accessible UI for Color Vision Deficiencies
In modern digital product design, relying exclusively on hue to communicate system status is one of the most common accessibility failures. For someone with Deuteranopia or Protanopia, a red 'Error' badge and a green 'Success' badge can look like virtually indistinguishable shades of yellowish-brown.
1. Dual Encoding (Icon + Color)
Always accompany color alerts with explicit iconography: a checkmark (✓) for success, an exclamation mark (⚠) for warnings, and an X (✗) for destructive errors.
2. Luminance Difference
Do not pair colors that share the exact same lightness. Even if colors shift into gray or yellow, a 3:1 luminance contrast difference will keep elements readable.
3. Chart Pattern Fills
For multi-series bar charts and pie charts, pair colors with distinct line dashes, hatched patterns, or direct data labels so users never have to guess between similar segments.
Frequently Asked Questions
How does the image upload color blindness simulator work?
When you upload an image or drop a screenshot, our client-side Canvas engine reads the sRGB pixel buffer, linearizes the gamma curve, and applies 3x3 physiological spectral transformation matrices (Brettel 1997 / Machado 2009). The resulting image is rendered at 60 FPS directly in your browser with zero server uploads.
Why is red-green color blindness (Deuteranopia & Protanopia) so common?
The genes for photopigment proteins in human L-cones (red) and M-cones (green) are located on the X chromosome. Because biological males have only one X chromosome, an alteration in either gene produces color vision deficiency in approximately 8% of all men (~1 in 12), compared to 0.5% of women (~1 in 200).
What does WCAG 2.1 Success Criterion 1.4.1 ('Use of Color') require?
WCAG 1.4.1 requires that color must not be used as the sole visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element. For example, form error states must include an error icon or explicit text label alongside a red border.
What are the best color pairs for color-blind safe UI interfaces?
Blue and Amber/Orange are the universally safest pair because blue activates S-cones and amber activates both remaining cones equally, making them distinctly separable across all forms of red-green color blindness. When styling charts, pairing Deep Blue (#2563EB) with Bright Orange (#F97316) prevents confusion.
Is my uploaded image sent to an external server or stored anywhere?
No, never. All image and screenshot processing executes strictly within your device's browser memory via the HTML5 Canvas API. No images, files, or telemetry are ever uploaded or transmitted to external servers.