Email marketing glossary

Color contrast

Color contrast is the difference between the background and foreground color in an email’s content. While this is important from a design perspective, it’s also crucial for creating accessible emails. An increased color contrast ratio enables readers with a low vision and visual impairment to better engage with content.

For instance, a 1:1 contrast ratio means that colors have minimal contrast, making it hard for subscribers with visual impairments to distinguish between email content and the background. The 21:1 ratio of black text on a white background means that the email content has a high color contrast, making it easier for low-vision readers to engage with content.

Check out Email on Acid’s Campaign Precheck accessibility feature that provides a color contrast checker so you don’t have to worry about calculating ratios.