W3C’s Web Accessibility Initiative provides strategies, standards, and resources to ensure that the internet is accessible for as many people as possible. The guidelines that underpin these standards are called the Web Content Accessibility Guidelines, or WCAG.
Color contrast is an important piece of the puzzle for accessibility on the web, and adhering to it makes the web more usable for the greatest number of people in the most varied situations.
Apps to test contrast:
- Chrome Dev Tools