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Underscore.js on new websites

JavaScript utility library providing functional helpers for collections, arrays and objects.

Sites using Underscore.js
58,955
since Jun 2026
Last 30 days
0.8%
of new sites, to Oct 18
-0.4 pts on the 30 days before
Last 7 days
0.8%
of new sites, 7-day average
no change on the week before
Rank in Javascript Library
#16
of 1549 tools, all time
First seen Jun 9, 2026
Last seen Oct 19, 2026
Website underscorejs.org

What we found

  1. About 1 in 120 websites that went live in the last 30 days were built with Underscore.js (0.8%).[1]
  2. Almost all new Underscore.js sites also use PHP.
  3. It is unusually common among e-commerce launches: 55%, against 20% across new sites.

Share of new sites using Underscore.js

0.0% 0.5% 1.0% 1.5% 10 Sep Oct

The line is the 7-day average share of new sites that use Underscore.js, since 10 September.

Who uses Underscore.js

Kind of site 15,832 sites with a known type
TypeSitesShareBar
E-commerce 8,725 55.1%
Health 2,389 15.1%
Education 887 5.6%
Marketing 676 4.3%
Finance 507 3.2%
Content 504 3.2%
Productivity 462 2.9%
Games 461 2.9%
Social 348 2.2%
Design 315 2.0%
Developer Tools 246 1.6%
Hiring & HR 123 0.8%
Country[2] 9,933 sites with a likely country
CountrySitesShareBar
India 2,432 24.5%
UK 1,363 13.7%
US 1,142 11.5%
France 1,004 10.1%
Iran 563 5.7%
Canada 427 4.3%
Australia 324 3.3%
Vietnam 320 3.2%
Italy 230 2.3%
Germany 215 2.2%
Poland 183 1.8%
Brazil 179 1.8%
Domain ending 58,816 sites
EndingSitesShareBar
.com 40,999 69.7%
.in 3,911 6.7%
.uk 1,547 2.6%
.store 1,543 2.6%
.online 1,269 2.2%
.co 1,029 1.8%
.org 1,025 1.7%
.fr 949 1.6%
.net 755 1.3%
.ca 625 1.1%
.us 606 1.0%
.site 556 1.0%
Green hosting[3] 283 checked sites since Apr 2026
SitesGreenBar
Underscore.js 54%
All new sites 47%

Javascript Library on new sites

# Movement Tool Share of all sites Share of category[4] Bar
1 – jQuery 14.1% 34.5%
2 – React Router 6.6% 16.2%
3 – Motion 6.0% 14.6%
4 – TanStack Router 4.4% 10.8%
5 – Swiper 3.4% 8.3%
…
16 ▼1 Underscore.js 1.0% 2.4%

All-time shares across the new sites we track: of all of them, and of the sites using any Javascript Library tool. Underscore.js is typically used alongside jQuery rather than instead of it. All 1549 in Javascript Library

Often used with Underscore.js

Tool Sites with both vs all new sites Bar
js-cookie 46,451 32x
Sourcebuster 44,501 30x
WooCommerce 46,697 29x
Contact Form 7 25,673 23x
Elementor 46,823 16x

Tools that turn up far more often on Underscore.js sites than on new sites in general, and how many times as common each one is there.

Recently launched products built on Underscore.js

378 of the 58,955 sites using Underscore.js are product launches we list individually. The other 58,577 are new business and personal sites: they count towards the figures above but are not listed here. A watch sends them to you.

Site Found Also detected
SwarmSMS – Turn your Android phones into an SMS gateway for WordPress swarmsms.com · Marketing · Australia Oct 19 jQuery Astra flatpickr js-cookie
Global construction projects | CONRADAR conradar.ai · Türkiye Oct 18 jQuery Cloudflare GoDaddy Google AdSense
aRCadeRally arcaderally.com · Poland Oct 18 jQuery Astra Bing Webmaster Elementor
Discover Business Journey of lenskart thenetworthbio.com Oct 17 jQuery Elementor Font Awesome Google Fonts
Properties Of A Chord Of A Circle I finitequest.com · South Africa Oct 16 jQuery All in One SEO Astra Bing Webmaster
Smart Photo Auto-Rotate photodigitizer.net Oct 16 jQuery AlternativeTo Elementor Essential Addons for Elementor
DESHANK | Golf Swing Analyser App – No Sensor, No Uploads deshank.com · Health · United Kingdom Oct 15 jQuery Angie AI Assistant Cloudflare Elementor
gvbro.com gvbro.com Oct 15 jQuery Chaty Contact Form 7 Elementor
accountcn.com accountcn.com · Crypto Oct 15 jQuery Animate.css Anime.js Chaty
Online WCAG accessibility tool wcag-accessibility-checker.visibitaly.com · Developer Tools · Italy Oct 15 jQuery Bing Webmaster cdnjs CleanTalk
i-Genie.ai i-genie.ai · United States Oct 15 jQuery Apollo.io Atlassian Cloudflare
Etiology I finitequest.com · South Africa Oct 15 jQuery All in One SEO Astra Bing Webmaster

Showing the most recent 12 of 378.

Watches, exports and the API give you all 58,955 sites using Underscore.js, from £15 a month.

Notes

  1. These figures cover websites that went live since April 2026, not the web as a whole.
  2. Country comes from what each site says about itself, such as a company registration, legal terms or a phone number, not just its domain ending. Too few sites state their country plainly for the usual count, so this one also counts single signals: a country domain ending, a phone number (for North America, its area code), a location the site declares in its own page metadata, or a country-specific vendor stack and the page language where they agree and nothing contradicts them. Read these as likely rather than certain.
  3. Green hosting is the share whose web host The Green Web Foundation lists as running on green energy, among sites checked since 1 April 2026, against the same share for every new site we checked over that time. Data from The Green Web Foundation.
  4. Some products people expect to see here are filed under a related category: UI Library.

How this page is made

FirstSited looks at each new website near the day it goes live and records what it was built with. We do not go back later, so these figures describe what sites launch with, not what they run today. A site counts towards Underscore.js when we detect Underscore.js on it at that look.

Every share on this page is a proportion of the new sites we were tracking at the time. Sites we found across the wider web count towards the figures, but only product launches are listed by name. How we detect technologies · How we find new sites

Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.