Hellenic Academic and Research Institutions CA vs Let's Encrypt

Let's Encrypt is used by more websites in our catalog: 1,161 use Hellenic Academic and Research Institutions CA and 466,882 use Let's Encrypt.

Hellenic Academic and Research Institutions CA sites have the higher median Ahrefs Domain Rating (Hellenic Academic and Research Institutions CA: 75, Let's Encrypt: 23).

Between 2026-06 and 2026-07, Hellenic Academic and Research Institutions CA went from 0.17% to 0.13% of all tracked sites, while Let's Encrypt went from 59% to 53%. Hellenic Academic and Research Institutions CA is gaining ground faster in our index.

No. A site runs a single SSL certificate authority, so Hellenic Academic and Research Institutions CA and Let's Encrypt 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.