JavaScript libraries
Who left Underscore.js, and who still runs it
29,311 websites in the top 1M run Underscore.js, observed directly from the rendered page in the July 2026 crawl.
8,320
stopped running it that month
589
of those are 11–500 employees
8,647
adopted it in the last year
Confirmed across two consecutive crawls, not a single month. Build the list →
Some companies running Underscore.js
Every row in a full list carries the prospect's whole detected stack.
Not currently available as a list.
What else they run
jQuery 89%Google Analytics 78%core-js 78%Open Graph 75%PHP 74%MySQL 71%Cloudflare 69%Google Font API 59%Google Tag Manager 58%jQuery UI 56%
Share of a 3,000-domain sample of Underscore.js users that also run each.