This is a checker to make sure websites are Section 508 Compliant.

https://www.powermapper.com/products/sortsite/checks/accessibility-checks/

The refresh in January of 2017 updated accessibility guidelines and requirements for information and communication technology (ICT) in the federal sector. It also updated guidelines for telecommunications and reorganized Section 508 and Section 255 guidelines to better align with and reflect recent communication technology innovations. The guidelines affect all federal agencies and vendors, contractors and partners of those agencies operating in the United States or abroad.

There are several laws related to Section 508, including laws that prohibit discrimination against individuals with disabilities. When talking about communications, the three most relevant related laws are:

• Americans with Disabilities Act (ADA): prohibits discrimination against individuals with disabilities.
• Section 255 of the Communications Act: requires telecommunications products and services to be accessible to people with disabilities.
• 21st Century Communications and Video Accessibility Act of 2010: requires advanced communications services and products to be accessible by people with disabilities.