Color Blindness Simulator
Ensure your UI design is accessible. Our free Color Blindness Simulator processes images locally in your browser, revealing how your graphics look to users with visual impairments.
What is the Color Blindness Simulator?
Over 300 million people worldwide experience some form of color vision deficiency (CVD). If your website uses red and green buttons to denote 'Delete' and 'Save' without text labels, users with Deuteranopia will literally not be able to tell the difference. This simulator acts as an instant accessibility auditor. You upload an image of your UI mockup, and the tool uses the HTML5 `<canvas>` API to apply specific mathematical matrix filters, simulating how the image looks to someone with Protanopia, Deuteranopia, or Tritanopia. Because corporate UI mockups are highly confidential, all image processing occurs strictly on your local machine.
Why Use Our Color Blindness Simulator?
- WCAG Auditing: Helps you meet critical web accessibility guidelines.
- Multiple Simulators: Tests for Red-Green and Blue-Yellow deficiencies.
- Zero Uploads: Your proprietary UX mockups never leave your computer.
- Instant Rendering: Bypasses server wait times for immediate visual feedback.
How to Use the Color Blindness Simulator
Drag and drop your UI screenshot into the input area.
Select a specific CVD filter (e.g., Deuteranopia - Green Blind).
The local canvas instantly repaints the image using the simulation algorithm.
Review the image to ensure critical UI elements are still distinguishable by contrast.
Frequently Asked Questions
That is exactly what a user with Red-Green color blindness sees. If your UI relies entirely on red/green distinctions, it will become unusable for them.
Absolutely not. The filtering uses local JavaScript matrix calculations via the HTML5 canvas.
Yes, you can right-click the filtered canvas and save it to show your design team.
All file processing is performed locally in your web browser. We do not upload, store, or view your data.