axe-core

Tests for WCAG 2.0, 2.1, and 2.2 at levels A, AA, and AAA, plus best practices, as documented in the rule descriptions.

Engineered to return accurate results without false positives, reducing noise in test reports, as stated in the manifesto.

Works with modern browsers, testing environments, and frameworks like unit and integration tests, fitting into existing workflows.

Supports multiple languages via locale files, allowing international teams to run tests in their native language.