What is a WCAG contrast checker?
A WCAG contrast checker measures the color contrast ratio between text and its background to make sure your content is readable for everyone, including users with low vision. The Web Content Accessibility Guidelines (WCAG) set minimum ratios, and failing them hurts usability, accessibility compliance and even SEO.
WCAG contrast requirements
| Level | Normal text | Large text |
|---|---|---|
| AA | 4.5 : 1 | 3 : 1 |
| AAA | 7 : 1 | 4.5 : 1 |
Large text means 18pt (~24px), or 14pt (~18.66px) bold. This contrast ratio calculator shows pass or fail for each level instantly.
Brand palette accessibility audit
Most contrast tools only check one pair of colors. This palette accessibility auditor builds a full contrast matrix of every color combination in your brand palette, so you can quickly see which text/background pairs are safe to use and which fail WCAG.
Key features
- Instant contrast ratio between any text and background color.
- WCAG AA & AAA pass/fail for normal and large text.
- Live text preview on your chosen colors.
- Hex input and color pickers with one-click swap.
- Full brand palette contrast matrix — every combination at a glance.
- Free, no signup, runs entirely in your browser.
Who is it for?
This accessibility checker is for web designers, developers and brand teams who need accessible, ADA / WCAG-compliant color combinations. Designers test palettes before launch, and developers use it to fix low-contrast text that fails audits and hurts usability and SEO.
Frequently asked questions
Why does color contrast matter?
Good contrast makes text readable for users with low vision or colour blindness, improves usability for everyone, and is required for ADA / accessibility compliance.
Is this accessibility tool free?
Yes — 100% free, no signup, runs entirely in your browser.
Who built this tool?
This free accessibility tool is built by Ideal Tech Community, a website development & digital marketing company in Chennai. Need an accessible, high-converting website? Get a free quote.