WCAG AA Contrast Requirements

UpdatedOctober 6, 2026

IAAP Audit provides structured accessibility audit services for organizations that need evidence-led review of websites, web applications, mobile apps, PDFs, documents, design systems, and critical user journeys. Our audits are designed for compliance, procurement, governance, and remediation teams that need clear findings, standards mapping, severity grading, screenshots, selectors, remediation guidance, and retest evidence. Audit scopes can be mapped to WCAG 2.1 AA, WCAG 2.2 AA, IS 17802, GIGW, Section 508, and EN 301 549. We also support SEBI digital accessibility audit preparation, including C1 platform inventory, C3 initial audit reporting, C4 remediation/retest evidence, and report-ready documentation for agreed scopes. IAAP Audit works with financial services, SaaS, education, healthcare, e-commerce, public-sector vendors, and compliance-sensitive digital teams that need practical accessibility review without vague reporting. Our focus is simple: identify barriers, document evidence, prioritize risk, guide remediation, and help teams move toward more accessible digital services.

WCAG AA contrast requirements cover more than normal body text.

Teams should check text, images of text, large text, UI components, states, icons, charts, and meaningful graphics.

Key ratios

Normal text: 4.5:1.
Large text: 3:1.
Non-text UI and graphics: 3:1.

These thresholds need to be measured against the actual adjacent background.

What to test

Test rendered pages and components, not only design files.

Check forms, buttons, badges, cards, menus, modals, focus states, errors, selected states, dashboards, PDFs, image backgrounds, and responsive layouts.

Evidence

Useful evidence includes the affected component, color values, measured ratio, threshold, WCAG criterion, screenshot, user impact, remediation guidance, and retest result.