AccessiBe is the more common of the two in our index: it runs on 277 websites against 110 for Nagich. Counts come from real scans, not vendor claims.
AccessiBe is an accessibility overlay which claims to provide ADA and WCAG compliance. The system scans and analyzes a website, and applies adjustments which they claim make your website ADA and WCAG 2.1 compliant.
Nagich is a website accessibility overlay provider from Israel.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.