A contrast ratio can reveal a likely readability issue, but accessibility depends on the complete interface and content context.
Check the actual text size, weight, state,…
Check the actual text size, weight, state, and background used in the interface. A ratio that looks acceptable in a large heading may not meet the same expectation for body copy.
Review focus states, links, error messages, icons,…
Review focus states, links, error messages, icons, charts, and non-text controls separately. Do not use color as the only way to communicate a status or action.
Test with keyboard navigation, screen readers, zoom,…
Test with keyboard navigation, screen readers, zoom, and real content. A numeric ratio is evidence for one decision, not a complete compliance certificate.
Use the related tool carefully
This guide is paired with a browser-only utility. The tool is a practical aid for small examples and inspection; it is not a substitute for application testing, a formal data pipeline, or professional review where the decision has higher consequences.
Open the related WCAG Color Contrast Checker