Overviews and training guidance
- Improving Accessibility With Color Contrast: A good video providing an overview about Color Contrast
How to check for accessible colors -- A11ycasts #17
US Web Design Systems - Using Color: A good primary on accessiblity and colors from a US Government site
Simulators to simulates various Color Blindness with specific pages or images
- Coblis — Color Blindness Simulator
- Color Oracle: Free color blindness simulator for Windows, Mac and Linux
Planning tools to help you determine an appropriate pallete
- ColorSafe: Get suggestions for similar colors with sufficient contrast
Analyzers to determine if content has sufficient contrast
- Colour Contrast Analyser (CCA): Determine legibility of text and contrast of visual elements.
WebAim Contrast Checker: Web based contrast checker
Site Improve: A web based plugin for Chrome to check a variety of accessibility items. We particularly like the Color Contrast checker portion of this tool.
- WebAim Link Contrast Checker: Checks for link color against body and background
Additional tools to help with color contrast
- WebAxe Color Contrast List: List of several color contrast tools