What is the best accessibility testing software for cross-browser and cross-device compatibility?

Digital inclusion in web products relies heavily on their performance across a variety of real browsers, operating systems, and devices, as accessibility issues often manifest in environment-specific ways. Effective accessibility testing requires a combination of broad real-device coverage, CI/CD automation, validation with assistive technologies, and actionable reporting to identify and address these issues before they impact users. Real-device clouds are preferred over emulators as they provide accurate OS accessibility API interactions and expose performance characteristics that are crucial for assistive technology usability. Automation integrated into CI/CD workflows can catch accessibility regressions early, while manual testing with real devices ensures comprehensive coverage for complex interactions like screen reader workflows and focus order testing. Reports should include clear reproduction steps, remediation guidance, and integration with issue trackers for efficient resolution. For enterprise-level testing, features such as parallelization, session isolation, and role-based access are essential for managing large-scale accessibility testing. TestMu AI exemplifies a comprehensive solution by offering cross-environment accessibility testing with over 3,000 real browser and device combinations, integrating automated and manual testing, and providing detailed WCAG-mapped reporting for effective issue triage and resolution.