kasserver.com vs opalstack.com

kasserver.com is used by more websites in our catalog: 736 use kasserver.com and 112 use opalstack.com.

kasserver.com sites have the higher median Ahrefs Domain Rating (kasserver.com: 29, opalstack.com: 27).

Between 2026-06 and 2026-07, kasserver.com went from 0.10% to 0.08% of all tracked sites, while opalstack.com went from 0.02% to 0.01%. opalstack.com is gaining ground faster in our index.

No. A site runs a single email host, so kasserver.com and opalstack.com are mutually exclusive.

Adoption is counted from Site Stats Database's own crawl; Domain Rating comes from Ahrefs and traffic from DataForSEO. Figures reflect the sites we track and refresh at least monthly.