Color Contrast Checker
Check WCAG contrast ratio between two colors and preview the pair live.
Check WCAG contrast ratio and pass or fail levels between two colors with a live sample preview.
Check WCAG contrast ratio and pass or fail levels between two colors with a live sample preview.
About the color contrast checker
How this tool works
Contrast checking is one of the most practical design utilities because accessibility issues often start with a color pair that looked fine in isolation.
This page keeps the workflow concrete with a ratio, pass or fail states, live preview, and copy-ready CSS output.
Where it is useful
It is especially helpful during design handoff, UI QA, and small theme changes where a quick browser-side check can prevent regressions.
The shared style widget also makes it easy to add more design helpers later without branching into isolated components.
- Check whether a UI color pair passes accessibility thresholds.
- Review button, card, and text colors during design QA.
- Generate copy-ready CSS while you test contrast options.
Example workflows
3 examplesDark text on a light background
AA and AAA pass or fail labels
Brand accent against white
Contrast ratio plus sample CSS
Low-contrast pair
Immediate fail state and clearer guidance
Common uses
3 ideas- Check whether a UI color pair passes accessibility thresholds.
- Review button, card, and text colors during design QA.
- Generate copy-ready CSS while you test contrast options.
FAQ
3 answersWhat does the color contrast checker measure?
It calculates the contrast ratio and then checks that ratio against WCAG AA and AAA thresholds.
Why does this tool include both a ratio and a preview?
Yes. The preview helps you judge the colors visually, while the ratio gives you a more objective accessibility check.
When should I use a contrast checker?
Use it for buttons, body text, cards, badges, and any other UI elements where legibility matters.