Here are some tools you can use to evaluate web site accessibility.
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Google Chrome
- Google Chrome's Chromevox Extension
- NC State University's Color Contrast Analyzer for Chrome - Can be used to evaluate color contrast on an entire web page or a region of a page. Includes images of text in its analysis.
- Chrome Accessibility Audit - View > Developer > Developer Tools > Audits
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- WebAIM Color Contrast Checker
- Accessibility Color Wheel 2.0 - Simulates how text/background colors would appear to colorblind viewers.
- Luminosity Colour Contrast Ratio Analyser
- MSF&W Contrast Ratio Calculator
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