First, accessiBe has a full web accessibility service that covers a range of standards including WCAG 2.1, ADA and others. It takes 2 minutes to install and automatically generates accessibility statements to help you comply and promote accessibility. The company says it's used on more than 247,778 sites so far, and you can try it for free for 7 days.
Another option is UserWay, which offers a suite of accessibility tools powered by artificial intelligence. That includes an Accessibility Widget, an Accessibility Checker, continuous monitoring, and a manual audit by certified auditors. UserWay says it offers ADA compliance and WCAG 2.1 & 2.2 conformance, and offers several pricing tiers.
If you prefer a hybrid approach, EqualWeb combines automated fixes with manual audits by experts to ensure compliance with the ADA, WCAG 2.2 and Section 508 standards. It offers a range of tools, including an AI Accessibility Widget, Web Accessibility Monitor and full audit process. It offers a 7-day free trial and pricing starting at $39 per month, so it's available to small businesses.