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Who left RoundCube, and who still runs it
406 websites in the top 1M run RoundCube, observed directly from the rendered page in the July 2026 crawl.
79
stopped running it that month
9
of those are 11–500 employees
149
adopted it in the last year
Confirmed across two consecutive crawls, not a single month. Build the list →
Some companies running RoundCube
Every row in a full list carries the prospect's whole detected stack.
Not currently available as a list.
What else they run
PHP 100%jQuery 100%jQuery UI 100%Bootstrap 75%HSTS 46%Apache HTTP Server 46%Nginx 45%Google Font API 23%Cloudflare 18%Google Analytics 13%
Share of a 406-domain sample of RoundCube users that also run each.