BootstrapCDN vs esm.sh

BootstrapCDN is used by more websites in our catalog: 39,625 use BootstrapCDN and 147 use esm.sh.

BootstrapCDN sites have the higher median Ahrefs Domain Rating (BootstrapCDN: 29, esm.sh: 28).

Between 2026-06 and 2026-07, BootstrapCDN went from 4.9% to 4.5% of all tracked sites, while esm.sh went from 0.02% to 0.02%. esm.sh is gaining ground faster in our index.

4 websites in our catalog use both BootstrapCDN and esm.sh.

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.