You can do a quick accessibility check for your website / community online, e.g. here: https://siteimprove.com/en-us/accessibility-website-checker/

You’ll get a score and some quick feedback that gives you a good first impression about the performance when it comes to accessibility. I haven’t done more detailed research yet.

edit: To get a first-hand experience you could download and use a free screen reader (for Windows) yourself: https://www.nvaccess.org/download/