For information on other available tools for evaluating the accessibility of web content, W3C provides a Web Accessibility Evaluation Tools List. This list has filters which allow users to find a tool that meets their needs. To determine what kind of tool you need and how they are able to assist you, see Selecting Web Accessibility Evaluation Tools.
Microsoft Office
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Accessibility checker - Microsoft provides step-by-step instructions on how to make your Office documents accessible to people with disabilities.
Color Contrast Checkers
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WebAIM Color Contrast Checker - This handy online tool includes a feature to “lighten” or “darken” existing colors until you find a combination that meets WCAG.
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Acart Communications' Contrast Checker - This tool tests color contrast compliance with the WCAG. It also allows you to view it in grayscale to see how the colors appear to a colorblind user.
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Color Contrast Analyzer - Chrome Extension