Free tool
Calculate the WCAG 2.1 contrast ratio between any two colors. Pass/fail at AA and AAA for normal and large text.
The quick brown fox
jumps over the lazy dog. 0123456789
Want kiro to check contrast across every page of a site automatically? Kiro AI accessibility audit runs WCAG 2.1 AA checks on every website canvas — every text element, every state, flagged with the rule, the ratio, and the element selector.