Whether you are designing, developing, testing or auditing, a contrast ratio checker is the best way to ensure your site or app passes accessibility criteria. As a designer you can use a simple value checker to plug in foreground and background color value as you use them. You could also use other tools to check final design designs in their entirety. As a developer or someone conducting a website accessibility audit, you’ll likely want to use tools that can check completed web pages.
Contrast Ratio Requirements for Text in WCAG 2.0 Level AA & AAA
When designing or developing accessible websites, web applications or mobile apps, it may be obvious that text should be very legible. After all, the more difficulty user have reading your information, the less likely they are to interact, engage, purchase or take whatever other action you consider key to success. This is doubly so when developing for persons with low-vision.
The Web Content Accessibility Guidelines (WCAG) 2.0 stipulate two minimum contrast ratios between text and its background color on websites, applications or mobile apps.
To meet the level AA success criteria text smaller than 18 point (or 14 point if bold) must have a 4.5:1 contrast ratio. All larger text must have a contrast ratio of 3:1 or greater.
The more stringent AAA criteria the requires text under 18 point (or 14 point if bold) to exceed a contrast ratio of 7:1. All larger text must have a contrast ratio of at least 4.5:1.
Curated by (Lifekludger)
Read full article at Source: Best Color Contrast Checkers for Accessibility Testing – Vance Bell, Philadelphia, PA