JavaScript libraries
Who left Closure Library, and who still runs it
1,721 websites in the top 1M run Closure Library, observed directly from the rendered page in the July 2026 crawl.
570
stopped running it that month
44
of those are 11–500 employees
1,291
adopted it in the last year
Confirmed across two consecutive crawls, not a single month. Build the list →
Some companies running Closure Library
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 83%Open Graph 79%reCAPTCHA 75%Funding Choices 74%Google AdSense 71%Google Tag Manager 69%Google Font API 69%jQuery 64%PHP 61%Cloudflare 60%
Share of a 1,721-domain sample of Closure Library users that also run each.