At a Glance: Contrast — The Color Accessibility App
Contrast is a neat little Mac app created by Sam Soffes and Matt Smith targeted towards UI designers and web developers. It provides easy access to the WCAG color contrast ratios, so you can design with accessibility in mind.
Contrast provides a color picker for you to quickly sample and test out your colors. You can still enter hex codes manually, but the picker makes things so easy. The app automatically updates, giving you instant feedback score about how accessible your designs are.
Contrast sits in your menu bar by default, but you can also tear it away into a floating window.