WhoCanUse
Explore how color contrast affects people with different visual impairments using WhoCanUse.
About WhoCanUse
WhoCanUse checks text and background color combinations for contrast across different visual conditions. Users set background and text colors, adjust text size and bold weight, and view the contrast ratio, WCAG grade, and simulated views for color vision deficiencies, cataracts, glaucoma, low vision, and situational effects such as direct sunlight and night shift mode.
Impairment percentages shown are estimates for individual conditions and do not cover all visual impairments or add up to 100%. A failing grade means the combination may cause visual strain and should be avoided if possible.
Key features
- Enter background and text colors using HEX and HSL controls
- Adjust text size and bold weight for contrast grading
- Displays contrast ratio with WCAG grades
- Previews combinations as seen with different color vision deficiencies
- Includes simulations for cataracts, glaucoma, and low vision
- Simulates direct sunlight and night shift screen effects
Best for: Designers and developers choosing text colors who need to check contrast for visual impairments.
Good for
- Shows one color pair across multiple vision conditions at once
- Factors text size and weight into the contrast grade
- Identifies sources for impairment percentage estimates
Watch out for
- Population figures are estimates and do not cover all visual impairments
- Addresses only color contrast for blindness and low vision, not full WCAG scope
WhoCanUse at a glance
- Website
- whocanuse.com
- Category
- Design & Creative › Color Tools
- Type
- Online tool
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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WhoCanUse FAQ
What does a failing grade mean?
The grade combines color contrast, text size, and text weight. A fail means the combination may cause visual strain and should be avoided if possible.
Where do the impairment percentages come from?
The percentages are sourced from colour-blindness.com and Vision Australia.
Why don't the percentages add up to 100%?
They are estimates for individual impairments and do not cover the full range of visual impairments.
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