Hi there -- We're not fully ADA compliant at this time. Can you speak a little more directly to your needs here? I might be able to suggest a good workaround depending on which part of the application you're working with, as some compliance items can be met based on how you build your mailings.
Adding alternate text to your images and links is the way to go here! If you're creating a mailing in the Editor, adding links to text and adding images both give the opportunity to add alternate text. In the image modal there's an "Alternate text" field and in the link modal there's a "Tooltip" field which also adds alternate text to links. That alternate text will show up in the inbox.
That should meet the requirements you're looking for specifically for you images. If you're coding your own email, Emma will render alternate text in the inbox in that situation as well. You'll need to be sure to add the alt text yourself there in the HTML if you're coding your own email.