Contrast is a free and open source WCAG color contrast checking application for Linux. The Web Content Accessibility Guidelines (WCAG) are part of a web accessibility guidelines published by the World Wide Web Consortium. Using this color Contrast checking app you can perfectly check the contrast between two colors with WCAG requirements. You can choose color from your desktop using the build-in color picker or via the hex code. It displays the result in A, AA and AAA score and also in text like Awesome, Pretty Good, Not Bad and Nope.