WCAG Contrast Checker —
Free AA & AAA Compliance Test
Test any colour pair against WCAG 2.1 and 2.2 contrast standards instantly. Built for designers and developers verifying accessibility compliance — free, no signup.
Open the Free WCAG Contrast Checker
Live contrast ratio, pass/fail badges for AA, AAA, AA Large, and AAA Large — instantly.
Check Contrast Free →WCAG Contrast Requirements at a Glance
| WCAG Version | Level | Normal Text | Large Text |
|---|---|---|---|
| WCAG 2.0 / 2.1 / 2.2 | AA | 4.5:1 | 3:1 |
| WCAG 2.0 / 2.1 / 2.2 | AAA | 7:1 | 4.5:1 |
The contrast ratio formula itself hasn't changed across WCAG versions — 2.0, 2.1, and 2.2 all use the same relative luminance calculation and the same 4.5:1 / 7:1 thresholds. WCAG 2.2 added new success criteria in other areas (like focus indicators and target size) but contrast requirements remain identical.
Who Needs to Test WCAG Contrast Compliance?
Web designers and developers building any public-facing website, especially government, healthcare, education, and e-commerce sites where ADA compliance carries legal weight. Product teams conducting accessibility audits before launch. QA engineers verifying design systems meet contrast standards across every component — buttons, links, form fields, alerts, and body text.
Pair your contrast testing with the right typography using our free font pairings generator — readable contrast and readable type go hand in hand.