JavaScript libraries
Who left core-js, and who still runs it
332,895 websites in the top 1M run core-js, observed directly from the rendered page in the July 2026 crawl.
48,676
stopped running it that month
1,999
of those are 11–500 employees
86,919
adopted it in the last year
Confirmed across two consecutive crawls, not a single month. Build the list →
Some companies running core-js
Every row in a full list carries the prospect's whole detected stack.
Not currently available as a list.
What else they run
Google Analytics 80%Open Graph 80%jQuery 73%Cloudflare 72%Facebook Pixel 61%Google Tag Manager 58%HSTS 55%Priority Hints 54%HTTP/3 52%Google Font API 46%
Share of a 3,000-domain sample of core-js users that also run each.