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Sites built with Underscore.js

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

#14 of 1506 in Javascript Library First seen: Jun 9, 2026 Last seen: Oct 12, 2026 Website: underscorejs.org
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20,207 new sites with Underscore.js first seen in the last 30 days.

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59,264 sites

58,995 found by StackScope, 269 via launch platforms

StackScope Wider Web 58,906 StackScope Discovery (Indie) 89 Product Hunt 245 PeerPush 12 Other 9 Hacker News 3
  • StackScope Wider Web 58,906
  • StackScope Discovery (Indie) 89
  • Product Hunt 245
  • PeerPush 12
  • Other 9
  • Hacker News 3
View: All sites All launches Launch platforms StackScope Discovery StackScope Wider Web
Last 7 days 0.9% +0.0pp
Most used with WordPress, jQuery, Google Fonts
Top product types E-commerce, Health, Education
Green hosting 53% vs 47% avg

Underscore.js has been detected on 59,264 launches we've crawled, with 6517 of those in October 2026 (0.9% of the month's launches so far). The 7-day rolling share is 0.9%, roughly steady week on week. Most recent detection: Praxissoftware für Aromatherapie & Kosmetik – Aromalog, today.

It's most commonly paired with WordPress, jQuery, and Google Fonts. By product type, the launches using it are most often E-commerce (59%), Health (13%), and Education (5%). By estimated origin, India (21%) and the United States (16%) lead close together. By domain ending, launches using it are 6.8 times as likely as the average launch to live on a .store domain.

What kind of products ship with Underscore.js

17,259 launches

E-commerce
59.17%
Health
13.18%
Education
4.86%
Marketing
3.75%
Productivity
2.91%
Content
2.74%
Finance
2.67%
Games
2.49%
Directory
2.14%
Social
1.88%
Design
1.73%
Developer Tools
1.34%
Hiring & HR
0.67%
AI
0.34%
Crypto
0.13%

Domain endings using Underscore.js

59,282 sites

  • .com 63.95%
  • .uk 6.51%
  • .in 6.41%
  • .org 2.95%
  • .de 2.61%
  • .store 2.50%
  • .online 2.05%
  • .co 1.70%
  • .ca 1.23%
  • .net 1.21%
  • .fr 1.19%
  • .us 0.98%
  • .site 0.90%
  • .xyz 0.79%
  • .au 0.49%

Country

56 of 59,264 sites, where we are confident of the country.

  • India India 21.43%
  • United States United States 16.07%
  • United Kingdom United Kingdom 14.29%
  • Australia Australia 12.50%
  • Vietnam Vietnam 7.14%
  • China China 5.36%
  • United Arab Emirates United Arab Emirates 3.57%
  • Bangladesh Bangladesh 3.57%
  • Netherlands Netherlands 3.57%
  • Singapore Singapore 3.57%
  • Finland Finland 1.79%
  • Greece Greece 1.79%
  • Italy Italy 1.79%
  • Nigeria Nigeria 1.79%
  • Romania Romania 1.79%

Share of new sites using Underscore.js

Each dot is one launch day. Line is the 7-day rolling average; weekly averages before July 2026. Chart starts at first detection.

0.9%
last 7 days
+0.0pp vs prior week
0.9%
October so far
6,517 of 706,214 sites
59,264
sites all time
since Jun 2026
Underscore.js daily detection trend Before 8 July 2026: launch platforms only. We began crawling the wider web on this date, so the cohort this share is measured against changes here. 10 September 2026: we improved our infrastructure to index new sites much sooner, often on the day they go live, so the cohort this share is measured against changes here. 5% 2% 0% Jun Jul Aug Sep Oct Weekly averages before this point, daily after. Jul 14 · 178 / 22561 = 0.8% Jul 15 · 137 / 18687 = 0.7% Jul 16 · 82 / 14916 = 0.5% Jul 17 · 149 / 20577 = 0.7% Jul 18 · 203 / 23600 = 0.9% Jul 19 · 196 / 27142 = 0.7% Jul 20 · 181 / 23775 = 0.8% Jul 21 · 175 / 22883 = 0.8% Jul 22 · 190 / 24336 = 0.8% Jul 23 · 155 / 18070 = 0.9% Jul 24 · 85 / 13954 = 0.6% Jul 25 · 78 / 9544 = 0.8% Jul 26 · 155 / 21643 = 0.7% Jul 27 · 293 / 37227 = 0.8% Jul 28 · 391 / 42006 = 0.9% Jul 29 · 514 / 55415 = 0.9% Jul 30 · 454 / 48667 = 0.9% Jul 31 · 527 / 56425 = 0.9% Aug 1 · 512 / 55357 = 0.9% Aug 2 · 618 / 54287 = 1.1% Aug 3 · 542 / 53077 = 1.0% Aug 4 · 439 / 40959 = 1.1% Aug 5 · 389 / 35602 = 1.1% Aug 6 · 314 / 39514 = 0.8% Aug 7 · 309 / 40759 = 0.8% Aug 8 · 306 / 43301 = 0.7% Aug 9 · 252 / 38193 = 0.7% Aug 10 · 322 / 32602 = 1.0% Aug 11 · 269 / 34824 = 0.8% Aug 12 · 285 / 37422 = 0.8% Aug 13 · 450 / 55140 = 0.8% Aug 14 · 515 / 55081 = 0.9% Aug 15 · 581 / 54240 = 1.1% Aug 16 · 586 / 54571 = 1.1% Aug 17 · 431 / 43901 = 1.0% Aug 18 · 576 / 56501 = 1.0% Aug 19 · 467 / 51619 = 0.9% Aug 20 · 672 / 69350 = 1.0% Aug 21 · 989 / 94562 = 1.0% Aug 22 · 1223 / 95269 = 1.3% Aug 23 · 1285 / 94421 = 1.4% Aug 24 · 1049 / 82360 = 1.3% Aug 25 · 1125 / 72069 = 1.6% Aug 26 · 835 / 67313 = 1.2% Aug 27 · 1065 / 88230 = 1.2% Aug 28 · 1198 / 88360 = 1.4% Aug 29 · 1224 / 88711 = 1.4% Aug 30 · 1340 / 101350 = 1.3% Aug 31 · 1261 / 100848 = 1.3% Sep 1 · 1221 / 104151 = 1.2% Sep 2 · 1204 / 110367 = 1.1% Sep 3 · 1294 / 104280 = 1.2% Sep 4 · 1167 / 99357 = 1.2% Sep 5 · 1264 / 103671 = 1.2% Sep 6 · 1187 / 90149 = 1.3% Sep 7 · 1310 / 87039 = 1.5% Sep 8 · 956 / 78623 = 1.2% Sep 9 · 1019 / 76142 = 1.3% Sep 10 · 910 / 83971 = 1.1% Sep 11 · 997 / 86430 = 1.2% Sep 12 · 626 / 55066 = 1.1% Sep 13 · 596 / 54757 = 1.1% Sep 14 · 557 / 55628 = 1.0% Sep 15 · 617 / 57743 = 1.1% Sep 16 · 866 / 59594 = 1.5% Sep 17 · 869 / 57752 = 1.5% Sep 18 · 764 / 53952 = 1.4% Sep 19 · 700 / 45838 = 1.5% Sep 20 · 655 / 45293 = 1.4% Sep 21 · 809 / 52184 = 1.6% Sep 22 · 779 / 56004 = 1.4% Sep 23 · 774 / 58851 = 1.3% Sep 24 · 625 / 54079 = 1.2% Sep 25 · 507 / 51924 = 1.0% Sep 26 · 1024 / 102686 = 1.0% Sep 27 · 587 / 53027 = 1.1% Sep 28 · 598 / 61453 = 1.0% Sep 29 · 795 / 78555 = 1.0% Sep 30 · 602 / 70021 = 0.9% Oct 1 · 597 / 69574 = 0.9% Oct 2 · 598 / 64950 = 0.9% Oct 3 · 438 / 53907 = 0.8% Oct 4 · 561 / 52452 = 1.1% Oct 5 · 503 / 64008 = 0.8% Oct 6 · 517 / 67782 = 0.8% Oct 7 · 546 / 67708 = 0.8% Oct 8 · 604 / 69382 = 0.9% Oct 9 · 629 / 70245 = 0.9% Oct 10 · 663 / 61098 = 1.1% Oct 11 · 861 / 65108 = 1.3%
May 18, 2026 90 days Oct 11, 2026

The shaded parts of the chart are measured against a different set of sites.

Grey: until 8 July 2026 we only tracked launches from launch platforms. From that date we crawl the wider web as well.

Amber: on 10 September 2026 we improved our infrastructure so we can index new sites much sooner, often on the day they go live. Sites found that early often haven't finished setting up, so anything usually added after launch reads lower from that date. We record each site as it was when we found it.

The share is a proportion of whatever we were tracking at the time, so it can step at these lines without the technology itself changing. For a single continuous measure, switch to launch platforms.

How StackScope detects technologies

Javascript Library leaders

Tool % of launches % of category
#1 – jQuery 14.31% 34.83%
#2 – React Router 6.66% 16.21%
#3 – Motion 6.05% 14.72%
#4 – TanStack Router 4.36% 10.62%
#5 – Swiper 3.50% 8.52%
…
#14 ▲2 Underscore.js Current page 1.08% 2.63%

Percentages show adoption among indie launches: the share of all analysed launches, and of launches using any Javascript Library tool.Underscore.js is typically used alongside jQuery rather than instead of it.Among September launches it ranked #13 in Javascript Library, up from #15 in August. All 1506 in Javascript Library →

Often used with

Tool Sites
WordPress 59,112
jQuery 59,108
Google Fonts 50,402
WooCommerce 47,904
Elementor 47,898

Tools most often detected on the same sites as Underscore.js.

Recent launches we can show

358 of the 59,264 sites using Underscore.js are product launches we list individually. The other 58,906 are sites we found crawling the wider web: they count towards the figures above, but we do not publish them one by one. How StackScope Discovery works

Praxissoftware für Aromatherapie & Kosmetik – Aromalog Oct 12, 2026 Health Screenshot of Common Nouns, a launch using Underscore.js Common Nouns Oct 12, 2026 · score 5.9 Screenshot of RFPrime, a launch using Underscore.js RFPrime Oct 12, 2026 · score 6.9 Productivity Screenshot of Dr. Vikash, a launch using Underscore.js Dr. Vikash Oct 12, 2026 · score 5.9 Health Screenshot of Savr Recipe Manager, a launch using Underscore.js Savr Recipe Manager Oct 11, 2026 · score 7.9 Screenshot of Campidu, a launch using Underscore.js Campidu Oct 11, 2026 · score 9.1 Nigeria Best Email Validation & List Cleaning Tool for Email Marketing | DataStreams.ai Oct 10, 2026 Marketing Untitled site Oct 10, 2026 Content Screenshot of Common Idioms/Proverbs, a launch using Underscore.js Common Idioms/Proverbs Oct 10, 2026 · score 5.9 Screenshot of Demand and Supply Analysis, a launch using Underscore.js Demand and Supply Analysis Oct 9, 2026 · score 5.9 Screenshot of Luxury Corporate Gifts in Dubai, a launch using Underscore.js Luxury Corporate Gifts in Dubai Oct 9, 2026 · score 2.9 United Arab Emirates Screenshot of Multiple Regression 1, a launch using Underscore.js Multiple Regression 1 Oct 8, 2026 · score 5.9

Showing the most recent 12 of 358.

The StackScope API serves all 59,264 sites using Underscore.js, filterable and exportable, from £15 a month.

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