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Preview of Color Blind & Low Vision Simulator

Color Blind & Low Vision Simulator by xirclebox

The Color Blind and Low Vision Simulator is an accessibility tool that allows users to test and observe how people with colorblindness or low vision may perceive web-based content.

Available on Firefox for Android™Available on Firefox for Android™
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Extension Metadata

Screenshots
An example of color bars showing Trichromacy or normal color perceptionAn example of color bars showing Protanomaly or red-weak color perceptionAn example of color bars showing tunnel vision where the edges are darker than the center of visionAn example of the UI in dark modeAn example of the UI in light mode
About this extension
Features:
• Light and Dark modes
• 9 color vision options
• 7 Low vision options

Types of color vision:
• Trichromacy (Normal vision)
• Protanopia (Red-blind)
• Protanomaly (Red-weak)
• Deuteranopia (Green-blind)
• Deuteranomaly (Green-weak)
• Tritanopia (Blue-blind)
• Tritanomaly (Blue-weak)
• Achromatopsia (Complete color blindness)
• Achromatomaly (Partial color blindness)

Types of low vision:
• Mild Blur (Slight vision impairment)
• Moderate Blur (Moderate vision impairment)
• Severe Blur (Severe vision impairment)
• Low Contrast (Reduced contrast sensitivity)
• Cataracts (Cloudy/yellowed vision)
• Tunnel Vision (Loss of peripheral vision)
• Central Vision Loss (Loss of central vision acuity)
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Permissions and data

Required permissions:

  • Access your data for all websites

Data collection:

  • The developer says this extension doesn't require data collection.
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More information
Add-on Links
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Version
2.0.1
Size
35.41 KB
Last updated
22 days ago (Mar 2, 2026)
Related Categories
  • Web Development
License
Mozilla Public License 2.0
Version History
  • See all versions
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