aDesigner is a disability simulator that helps designers ensure that their content and applications are accessible and usable by the visually impaired.

Colour contrast checker to check for accessibility issues.

Robust, efficient and accurate accessibility testing tools for all Built on the world’s most popular accessibility testing library, axe-core. Deque’s suite of axe tools offers full coverage for your testing and compliance needs.

A website for getting different information for colors (different formats, complementary color) , especial a color blindness simulator.

Evaluate web accessibility within your browser. WAVE is a web accessibility evaluation tool developed by WebAIM.org.

Free and open source. Solve accessibility issues before they reach your customers.