Courts have taken essentially the following position on the issue of whether websites are places of public accommodation: Website accessibility fulfills the spirit of the ADA by lowering the barriers for people with disabilities to participate in business and commerce. As such, commercial websites need to comply with ADA regulations. Judges have reached this conclusion in several high-profile cases, such as the National Federation of the Blind’s lawsuit against the Scribd digital library. As a result of this case, Scribd agreed to redesign its website to work with screen reader software by the end of 2017.
For most people, the Americans with Disabilities Act (ADA) conjures up pictures of physical accommodations such as wheelchair ramps near building entrances, handicapped parking spaces, and the use of braille writing on signs and placards. These measures have been tremendously valuable in helping the 56.7 million Americans with a disability function and thrive within society.
Two agencies within the U.S. Department of Labor enforce parts of the ADA. The Office of Federal Contract Compliance Programs (OFCCP) has coordinating authority under the employment-related provisions of the ADA. The Civil Rights Center (CRC) is responsible for enforcing Title II of the ADA as it applies to the labor- and workforce-related practices of state and local governments and other public entities. Visit the Laws & Regulations subtopic for specific information on these provisions.
This annual deduction of up to $15,000 is available to businesses of any size for the costs of removing barriers for people with disabilities, including the following: providing accessible parking spaces, ramps, and curb cuts; providing wheelchair-accessible telephones, water fountains, and restrooms; making walkways at least 48 inches wide; and making entrances accessible.
I should mention one caveat to all of this. Businesses that are required to comply but don't have the ability to bring their websites into compliance can provide an accessible alternative to provide the same information, goods, and services that they provide online, like a staffed phone line. The trick, however, is that this option has to provide at least equal access, including in terms of hours of operation. And, as we know, the internet is around 24/7, so good luck with that. 

The ADA prohibits discrimination on the basis of disability and says that places of public accommodation (including private commercial enterprises) need to make accommodations for the disabled (42 U.S.C. § 12182).  Importantly, a place of public accommodation, per 42 U.S.C. § 12181(7), amounts to a privately operated facility whose operations affect commerce.   However, since the ADA came pre Internet era, the ADA didn’t contemplate or mention websites or apps.