Color Blindness Simulator
Upload any image and simulate how it appears to people with 8 types of color vision deficiency — protanopia, deuteranopia, tritanopia, achromatopsia, and more. Side-by-side comparison with the original. All simulation runs locally in your browser using scientifically validated color transformation matrices — no signup required.
Upload any image and simulate how it appears to people with different types of color vision deficiency. Choose from 8 CVD types including protanopia, deuteranopia, tritanopia, and achromatopsia. All processing runs locally in your browser — no signup required.
Why Use Our Color Blindness Simulator?
Instant Color Blindness Simulation
Simulate how your image appears to people with protanopia, deuteranopia, tritanopia, achromatopsia, and 4 more CVD types instantly in your browser — no waiting, no server calls.
Secure Color Blindness Simulator Online
All simulation processing runs locally in your browser using canvas pixel math. Your images never leave your device, ensuring 100% privacy every time you use our color blindness simulator online.
Color Blindness Simulator — No Installation
Use our color blindness simulator directly in any browser with no downloads, plugins, or account required. Test any image for accessibility from any device, anywhere, completely free.
8 CVD Types with Side-by-Side Preview
Compare the original image against the simulated view side by side. Covers all major color vision deficiencies — from the most common deuteranomaly to complete achromatopsia.
Common Use Cases for Color Blindness Simulator
UI/UX Accessibility Testing
Test your app or website screenshots for color accessibility before shipping. Our color blindness simulator reveals whether your UI is usable for the ~8% of males with some form of color vision deficiency.
Data Visualization Review
Charts, graphs, and maps that rely on color to convey meaning can be unreadable for color-blind users. Simulate your visualizations to ensure data is distinguishable without relying on color alone.
Brand and Logo Design
Check that your brand colors, logos, and marketing materials remain recognizable and legible across all major CVD types. Our color blindness simulator helps designers make inclusive color choices from the start.
Game and App Development
Games and apps often use color-coded indicators for health, status, or alerts. Simulate your UI assets to ensure color-blind players and users can distinguish critical information without confusion.
Print and Packaging Design
Packaging, labels, and print materials need to communicate clearly to all customers. Use our color blindness simulator to verify that color-coded information on packaging is accessible to color-blind consumers.
Educational and Medical Materials
Educational diagrams, medical illustrations, and scientific figures often use color to differentiate elements. Simulate these materials to ensure they are accessible to students and patients with color vision deficiency.
Understanding Color Blindness and Color Vision Deficiency
What is color blindness?
Color blindness(color vision deficiency, or CVD) is a condition where the eye's cone cells — which detect red, green, and blue light — are absent or function differently than normal. The human eye has three types of cones: L-cones (sensitive to long/red wavelengths), M-cones (medium/green), and S-cones (short/blue). When one or more cone types are missing or altered, certain colors become indistinguishable. Our color blindness simulator applies scientifically validated transformation matrices to show how images appear to people with each type of CVD.
How our color blindness simulator works
- Upload Your Image: Drop any PNG, JPG, WebP, GIF, or BMP image into the color blindness simulator. The image is loaded into a browser canvas — it never leaves your device.
- Select a CVD Type:Choose from 8 color vision deficiency types. The simulator applies a 3×3 color transformation matrix (based on the Brettel, Viénot & Mollon model) to each pixel, converting sRGB values through linear light space for accurate results.
- Compare and Download: The original and simulated images are shown side by side. Download the simulated PNG to include in accessibility reports or design reviews.
Types of color vision deficiency
- Deuteranomaly — reduced M-cone (green) sensitivity. The most common CVD, affecting ~5% of males. Red and green hues appear similar.
- Protanomaly — reduced L-cone (red) sensitivity. Affects ~1% of males. Reds appear darker and less saturated.
- Deuteranopia — complete absence of M-cones. Affects ~1% of males. Severe red-green confusion.
- Protanopia — complete absence of L-cones. Affects ~1% of males. Reds appear very dark; red-green discrimination is lost.
- Tritanopia / Tritanomaly — absent or reduced S-cones (blue). Very rare. Blue-yellow discrimination is lost.
- Achromatopsia — complete color blindness with only rod cells functioning. Extremely rare. The world appears in shades of gray.
Important limitations
The color blindness simulator uses mathematical approximations based on published research models. Individual experiences of color vision deficiency vary — the simulation provides a representative view, not an exact reproduction of any individual's perception. Use the simulator as a design and accessibility testing aid, not as a medical diagnostic tool.
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Frequently Asked Questions About Color Blindness Simulator
Common questions about color vision deficiency simulation and accessibility testing
A color blindness simulator transforms an image to show how it appears to people with different types of color vision deficiency (CVD). Our color blindness simulator runs entirely in your browser — upload any image, select a CVD type, and see the simulated result instantly with no server uploads.
Our color blindness simulator uses 3×3 transformation matrices based on the Brettel, Viénot & Mollon (1997) model, applied in linear light space for accurate sRGB conversion. The simulation provides a scientifically validated approximation of how colors appear to people with each CVD type. Individual experiences vary, so treat the results as a representative guide rather than an exact reproduction.
The simulator supports 8 types: protanopia (no red cones), deuteranopia (no green cones), tritanopia (no blue cones), protanomaly (reduced red sensitivity), deuteranomaly (reduced green sensitivity — the most common), tritanomaly (reduced blue sensitivity), achromatopsia (complete color blindness), and achromatomaly (partial achromatopsia).
Absolutely. All simulation processing happens locally in your browser using the HTML Canvas API. Your images are never sent to any server, stored, or logged. Your image data stays completely private on your device every time you use our color blindness simulator online.
Yes! Our color blindness simulator is 100% free with no signup, no account, and no usage limits. Simulate any image for any CVD type as many times as you need — completely free, forever.
Deuteranomaly is the most common form of color vision deficiency, affecting approximately 5% of males. It involves reduced sensitivity of the green (M) cone cells, making red and green hues difficult to distinguish. Deuteranopia (complete absence of green cones) affects about 1% of males. Together, red-green color blindness affects roughly 8% of males and 0.5% of females.
The color blindness simulator supports PNG, JPG/JPEG, WebP, GIF, and BMP images. The simulated output is always exported as PNG to preserve quality. There are no file size limits — the simulation runs entirely in your browser.
Take screenshots of your UI, charts, or designs and run them through the simulator for each major CVD type — especially deuteranomaly and protanopia, which are the most common. If important information is lost or elements become indistinguishable in the simulation, consider adding patterns, labels, or icons alongside color to ensure accessibility for all users.
Both are forms of red-green color blindness, but they affect different cone types. Protanopia is the complete absence of L-cones (red-sensitive), causing reds to appear very dark and making red-green discrimination impossible. Deuteranopia is the complete absence of M-cones (green-sensitive), causing similar red-green confusion but without the darkening of reds. Both affect approximately 1% of males.