Sim Daltonism

From the perspective of a color blind person, some colors are impossible to distinguish. Sim Daltonism lets you visualize colors as they are perceived with various types of color blindness. Use the camera on your iOS device, or use the Mac app to filter a region of the screen.

Tenon.io

Tenon.io can identify 508 and WCAG 2.0 issues in any environment - even on your developer's laptop. Because production is a bad place to discover bugs.

Check your website for accessibility issues.

WebAIM: Color Contrast Checker

Ensure a proper contrast when choosing colors for your design.

Accessibility Wins: Google Chrome’s Color Contrast Debugger

Chrome Canary’s developer tools have an experiment where you can debug color contrast right in the style inspector.