75). To check if you’re using the right amount of contrast, there is a list of color-contrast checking tools in the color section of the Web Accessibility: Resources webpage.
An accessibility checker tool for validating the color contrast based on WCAG 2.0 and WCAG 2.1 standard. The formula (L1/L2) for contrast is based on [ISO-9241-3] and [ANSI-HFES-100-1988 ...