A tool to calculate the contrast ratio between any two valid CSS colors.See the website
Description
Contrast-ratio is a great tool where you can enter the color codes manually, and it will show the ratio as a number marked with green if this color combination passed the contrast requirement, or red if it doesn't.
Related tools (Accessibility Testing)
Accessibility engine for automated Web UI testing
An annual accessibility analysis of the top 1,000,000 home pages
Educating customers on web-accessibility overlays.
A CSS stylesheet to quickly highlight a11y concerns.