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domain	whocanuse.com
summary	The website, whocanuse.com, is a tool designed to demonstrate the impact of color contrast on individuals with various visual impairments. It evaluates color combinations using a contrast ratio of 8.41:1, achieving AAA WCAG grading, indicating optimal accessibility for regular vision and people with trichromatic color blindness. The tool assesses how different color deficiencies – including protanomaly, protanopia, deuteranomaly, deuteranopia, tritanomaly, tritanopia, achromatopsia, and achromatality – affect color perception. It also accounts for conditions like cataracts, glaucoma, low vision, and the effects of situational events (direct sunlight, night shift mode). The website utilizes a “Color-blind” plugin to translate HEX codes into color values suitable for those with specific color blindness types.
title	WhoCanUse
description	A tool that brings attention and understanding to how color contrast can affect people with different visual impairments.
keywords	color, vision, contrast, reds, greens, blindness, people, impairments, text, combination, grading, trouble, blind, more, using, grade, ratio
upstreams
downstreams
nslookup	A 66.33.60.129, A 66.33.60.130
created	2026-02-14
updated	2026-02-14
summarized	2026-03-01