Use the following Accessibility and contrast test online tools to test your color palette for accessibility and contrast . A color accessibility test is important for all visual designers, UX/UI designers and developers.
Hex Naw is a tool that helps designers and developers test entire color systems for contrast and accessibility. Plug in your palette or color system and let Hex Naw do the rest
The application allows designers to experiment with color combinations, examine them under the aspect of accessibility guidelines and to create custom color palettes.
Some more accessibility and contrast test online tools