Determine Sufficient Colour Contrast
Check My Colours is a free tool for checking foreground and background colour combinations of all DOM elements to determine whether they provide sufficient contrast when viewed by someone having colour deficits.
All the tests that Check My Colours conducts are based on the algorithms suggested by the World Wide Web Consortium (W3C).
Enter a URL and Check My Colours will provide a report with the results for each element include whether they pass or fail. This means it is very quick to see whether people with colour deficits would have a problem viewing your website.
Check My Colours is free.