Browser fingerprinting; JavaScript libraries
Who left ClientJS, and who still runs it
672 websites in the top 1M run ClientJS, observed directly from the rendered page in the July 2026 crawl.
41
stopped running it that month
5
of those are 11–500 employees
321
adopted it in the last year
Confirmed across two consecutive crawls, not a single month. Build the list →
Some companies running ClientJS
Every row in a full list carries the prospect's whole detected stack.
Not currently available as a list.
What else they run
jQuery 83%Cloudflare 67%Google Font API 58%HTTP/3 49%Google Analytics 45%Microsoft ASP.NET 45%core-js 39%FingerprintJS 39%Google Tag Manager 38%HSTS 37%
Share of a 672-domain sample of ClientJS users that also run each.