axe-core

axe-core is a JavaScript library developed by Deque Systems, providing a robust and highly accurate automated accessibility testing engine. It's designed to be integrated directly into web applications and testing frameworks, enabling developers to identify accessibility issues early in the development lifecycle. axe-core adheres to WCAG 2.1 and 2.2 guidelines, offering a comprehensive set of rules. It's particularly valuable for teams using React, Angular, or Vue.js, as it can be easily integrated into build processes and CI/CD pipelines.

Its accuracy and extensibility make it a top choice for professional accessibility testing.