co.uk vs Fastmail

co.uk is used by more websites in our catalog: 2,691 use co.uk and 1,580 use Fastmail.

Fastmail sites have the higher median Ahrefs Domain Rating (co.uk: 26, Fastmail: 38).

Between 2026-06 and 2026-07, co.uk went from 0.37% to 0.31% of all tracked sites, while Fastmail went from 0.22% to 0.18%. Fastmail is gaining ground faster in our index.

No. A site runs a single email host, so co.uk and Fastmail 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.