Spectrum is a free Chrome add-on developed by Yehor Lvivski that allows you to instantly test your web pages for different types of color vision deficiency (CVD). With an estimated 200 million people worldwide affected by some form of CVD, this extension is a valuable tool for web developers and designers.

Color vision deficiency can affect a person's ability to distinguish certain colors, and Spectrum helps identify any potential issues with color contrast on web pages. This is particularly useful for websites with data visualizations, as some colors may not be distinguishable from others in charts.

One of the standout features of Spectrum is its ability to support flash-enabled websites. This means that even websites utilizing Flash can be tested for color vision deficiency, ensuring a more inclusive web experience for all users.

Overall, Spectrum is a valuable tool for web developers and designers who want to ensure that their web pages are accessible and user-friendly for individuals with color vision deficiency.