Klevu supports majority of ADA and WCAG requirements that are relevant to search interfaces. We review our out of the box implementations on a regular basis and are committed to ensuring we meet these guidelines.
While reviewing our UIs for the WCAG 2.0 Level AA (using the achecker online tool), we did not find any "known problems". The report had a few low-priority unmet checkpoints (e.g. "images may contain text with poor contrast" or "Link text may not be meaningful"), however, in such cases, Klevu is relying on the merchants to take appropriate actions at their end (e.g. by uploading the appropriate images and giving products appropriate names that we use as alt texts when displaying images).
Our understanding is that such "potential problems" as highlighted in the report, do not fail the compliant test. In case you come across any "known problem" that results in the failure of the compliance test, we request you to let us know and we will get back to you.