WCAG 2.1 Level A & AA Success Criteria

The Web Content Accessibility Guidelines (WCAG) 2.1 define the international standard for web accessibility. Level A and AA criteria cover 50 success criteria organized across 4 principles.

Since the European Accessibility Act (June 2025), WCAG 2.1 AA compliance is mandatory for public websites and businesses with over 250 employees or €50M revenue. Scrutia automatically tests these criteria in 2 minutes.

30 Level A criteria20 Level AA criteria4 principles

The 4 Principles

Perceivable
20 criteria
9 A11 AA
Operable
17 criteria
14 A3 AA
Understandable
10 criteria
5 A5 AA
Robust
3 criteria
2 A1 AA

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The 4 Principles

Perceivable

Operable

Understandable

Robust

Is your site WCAG 2.1 AA compliant?