The JuicyStudio Colour Contrast Analyser now redirects to the Luminosity Colour Contrast Ratio Analyser. The old Accessibility Evaluation and Repair Tools (AERT) suggested algorithm for determining colour contrast was replaced with the WCAG 2.0's luminosity contrast algorithm.
Success Criterion 1.4.3 of WCAG 2.0 requires that the visual presentation of text and images of text has a contrast ratio of at least 4.5:1. See the site for descriptions of the exceptions for large text, incidental text or images, and logotypes.
Colorblind Web Page Filter tool provided by Toptal. Use the Colorblind Colorlab to select safe colors early in the design process. To use the tool, indicate a resource to be viewed (for example: a web page URL, an image), and select a color filter to be applied to that resource. Then click the Fetch and Filter button. New
Colorblind Web Page Filter Enter the URL resource to be viewed, and a color filter to be applied to that resource. If you only use one filter, use the grayscale filter which will not only point out potential problem areas, but will also let you see more clearly which areas the filter is unable to process. Updated
Colblindor is all about color vision deficiency. It presents all you ever wanted to know, learn and try out concerning color blindness. Please feel free to browse the site and find online color blindness tests, some tools to check color names or many interesting facts.
Color Laboratory The color laboratory allows you to select colors and see how they appear next to one another and in various foreground / background combinations. It also allows you to see those colors as they might appear to color-blind users.
Color Oracle is a free color blindness simulator for Window, Mac and Linux. It takes the guesswork out of designing for color blindness by showing you in real time what people with common color vision impairments will see.
Colour Vision Easy to use tool to quickly see color deficiencies with color palettes for Protanomaly (low red), Protanopia (no red), Deuteranomaly (low green), Deutanopia (no green), Tritanomaly (low blue), Tritanopia (no blue), Typical Monochromatic, ATypical Monochromatic.
Vischeck Test your Web design for how it looks to various color blind impairments. Run Vischeck on your own image files or run Vischeck on a Web page: on your desktop or online.
Visibone Information about colour blindness, with colour cards simulating colour spectrums as they appear to those with colour deficient vision.
Web-Based Color Vision Test EnChroma Color Blindness Test. Results may vary depending on display quality. This test is not a medical diagnosis. By taking this test you understand and accept that your test results may be anonymously recorded on our server for quality assurance purposes. Please consult an eye care professional for more information regarding color vision deficiency.