Fly.io vs Heroku

Fly.io is used by more websites in our catalog: 252 use Fly.io and 219 use Heroku.

Fly.io sites have the higher median Ahrefs Domain Rating (Fly.io: 29, Heroku: 2).

Between 2026-06 and 2026-07, Fly.io went from 0.03% to 0.03% of all tracked sites, while Heroku went from 0.03% to 0.02%. Heroku is gaining ground faster in our index.

0 websites in our catalog use both Fly.io and Heroku.

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.