I've tested the accessibility of this site with the Windows Narrator and the WAVE accessibility evaluation tool. The Narrator tool accurately read the pages, including the image captions. The WAVE tool showed minimal accessibility issues, but it's not clear if WAVE could read the notion.so site entirely. Further testing the the JAWS reader is necessary.

From the original Check, Please! accessibility page:

"Our accessibility approach is to write accessible pages in Notion (e.g. add descriptive image captions, use descriptive links) using standard Notion features, and for the vast majority of students — even those with accommodations — the live online version is the best experience. For students that require a downloadable offline version of the materials, we recommend HTML export as we've found the PDF export does not play well with screenreaders. (Seriously, do not post PDF exports if you have accessibility concerns)"