arsmtp.com vs opalstack.com

arsmtp.com is used by more websites in our catalog: 2,813 use arsmtp.com and 112 use opalstack.com.

arsmtp.com sites have the higher median Ahrefs Domain Rating (arsmtp.com: 30, opalstack.com: 27).

Between 2026-06 and 2026-07, arsmtp.com went from 0.34% to 0.32% 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 arsmtp.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.