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ChromaNope is a color-blindness simulator made for the web. Simply enter the URL(address) of a website that you'd like to see a simulated color deficient view of.
The three most common types of color blindness are all represented in ChromaNopes simulation (Protonopia, Deuteranopia, and Tritanopia). The purpose of this tool is to help designers see their entire web design as a person with color-blindness might. This helps designers make informed decisions about accessibility by identifying potential problems that color-blind users might have, problems that might have otherwise gone unnoticed.