Color Blindness Filter for Email Previews

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Color blindness affects 8% of the male population around the world, leading to various degrees of what is known as “color deficiency,” or difficulty distinguishing between different colors. While many different types of color blindness exist, the majority of color blind individuals are unable to distinguish differences between red and green.

Usability and accessibility principles for web design encourage sufficient color contrast in text and images to ensure that content is easily distinguishable. While we recognize that not all web design principles are applicable to email design, color blindness surely does.

We’re pleased to introduce a new feature for Email Previews in Litmus that allows you to simulate what a person with a red-green color deficiency might see when viewing your email:

Litmus color blindness filter

You can select this option when starting your Email Preview by checking the box for “Color blindness” found in the Desktop Email Clients area:

Additional tools and resources for color blindness and designing usable/accessible web experiences:

Designing More Usable Web Sites
American Optometric Association
W3C Web Accessibility Initiative: Accesibility Principles Color Blindness and Website Design


Optimize your emails for all of your subscribers, including those with color blindness.

Sign up for Litmus today→