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
Open Graph 78%Google Analytics 78%jQuery 73%Cloudflare 70%Facebook Pixel 59%Google Tag Manager 57%HSTS 53%HTTP/3 52%Priority Hints 51%Google Font API 47%
Share of a 3,000-domain sample of core-js users that also run each.