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Sites built with Day.js

Lightweight JavaScript library for parsing, validating, and formatting dates.

#68 of 1462 in Javascript Library First seen: Jun 25, 2026 Last seen: Oct 6, 2026 Website: day.js.org
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3,951 sites

3,939 found by StackScope, 12 via launch platforms

StackScope Wider Web 3,910 StackScope Discovery (Indie) 29 Product Hunt 7 Hacker News 2 Other 2 PeerPush 1
  • StackScope Wider Web 3,910
  • StackScope Discovery (Indie) 29
  • Product Hunt 7
  • Hacker News 2
  • Other 2
  • PeerPush 1
View: All sites All launches Launch platforms StackScope Discovery StackScope Wider Web
Last 7 days 0.1% -0.0pp
Most used with jQuery, Google Fonts, HTTP/3
Top product types E-commerce, Games, Health

Day.js has been detected on 3,951 launches we've crawled, with 220 of those in October 2026 (0.1% of the month's launches so far). The 7-day rolling share is 0.1%, roughly steady week on week. Most recent detection: moshpit | moshr, yesterday.

It's most commonly paired with jQuery, Google Fonts, and HTTP/3. By product type, the launches using it are most often E-commerce (45%), Games (15%), and Health (11%). By domain ending, launches using it are 18.1 times as likely as the average launch to live on a .store domain. The 13 scored launches using Day.js average a StackScope score of 5.9 out of 10, against 6.5 across all launches we score.

What kind of products ship with Day.js

900 launches

E-commerce
45.44%
Games
14.67%
Health
10.56%
Education
4.89%
Social
4.89%
Content
4.78%
Productivity
4.11%
Developer Tools
3.33%
Finance
2.78%
Marketing
1.33%
Design
1.11%
Hiring & HR
1.00%
AI
0.67%
Crypto
0.22%
Directory
0.22%

Domain endings using Day.js

3,946 sites

  • .com 67.03%
  • .store 6.87%
  • .online 3.17%
  • .net 2.89%
  • .in 2.41%
  • .co 2.10%
  • .org 1.70%
  • .me 1.39%
  • .uk 1.27%
  • .vip 1.12%
  • .site 1.06%
  • .fr 0.96%
  • .dev 0.84%
  • .ca 0.79%
  • .xyz 0.61%

Country

406 of 3,951 sites, where we are semi-confident of the country.

  • Japan Japan 19.70%
  • India India 15.76%
  • United Kingdom United Kingdom 11.08%
  • Iran Iran 11.08%
  • France France 9.36%
  • Canada Canada 4.19%
  • United States United States 3.45%
  • Slovakia Slovakia 2.96%
  • Australia Australia 2.71%
  • Pakistan Pakistan 2.22%
  • Germany Germany 1.97%
  • Brazil Brazil 1.48%
  • Switzerland Switzerland 1.48%
  • South Korea South Korea 1.48%
  • China China 1.23%

Share of new sites using Day.js

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

0.1%
last 7 days
-0.0pp vs prior week
0.1%
October so far
220 of 364,976 sites
3,951
sites all time
since Jun 2026
Day.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 9 · 14 / 24435 = 0.1% Jul 10 · 8 / 23148 = 0.0% Jul 11 · 7 / 16619 = 0.0% Jul 12 · 22 / 20895 = 0.1% Jul 13 · 25 / 21733 = 0.1% Jul 14 · 18 / 21310 = 0.1% Jul 15 · 16 / 18211 = 0.1% Jul 16 · 4 / 14835 = 0.0% Jul 17 · 11 / 20478 = 0.1% Jul 18 · 6 / 23506 = 0.0% Jul 19 · 10 / 27090 = 0.0% Jul 20 · 10 / 23704 = 0.0% Jul 21 · 10 / 22781 = 0.0% Jul 22 · 13 / 24307 = 0.1% Jul 23 · 7 / 17973 = 0.0% Jul 24 · 6 / 13870 = 0.0% Jul 25 · 2 / 9514 = 0.0% Jul 26 · 18 / 21551 = 0.1% Jul 27 · 35 / 37109 = 0.1% Jul 28 · 29 / 41850 = 0.1% Jul 29 · 101 / 55203 = 0.2% Jul 30 · 42 / 48477 = 0.1% Jul 31 · 56 / 56316 = 0.1% Aug 1 · 31 / 55308 = 0.1% Aug 2 · 46 / 54195 = 0.1% Aug 3 · 36 / 53013 = 0.1% Aug 4 · 31 / 40897 = 0.1% Aug 5 · 29 / 35563 = 0.1% Aug 6 · 26 / 39477 = 0.1% Aug 7 · 32 / 40713 = 0.1% Aug 8 · 35 / 42198 = 0.1% Aug 9 · 39 / 36919 = 0.1% Aug 10 · 16 / 31090 = 0.1% Aug 11 · 23 / 33749 = 0.1% Aug 12 · 24 / 35591 = 0.1% Aug 13 · 44 / 53127 = 0.1% Aug 14 · 46 / 54565 = 0.1% Aug 15 · 51 / 53928 = 0.1% Aug 16 · 47 / 54332 = 0.1% Aug 17 · 24 / 43704 = 0.1% Aug 18 · 53 / 56225 = 0.1% Aug 19 · 37 / 51431 = 0.1% Aug 20 · 53 / 69192 = 0.1% Aug 21 · 68 / 94359 = 0.1% Aug 22 · 94 / 95063 = 0.1% Aug 23 · 91 / 94165 = 0.1% Aug 24 · 79 / 82108 = 0.1% Aug 25 · 73 / 71788 = 0.1% Aug 26 · 41 / 67001 = 0.1% Aug 27 · 75 / 87497 = 0.1% Aug 28 · 76 / 87444 = 0.1% Aug 29 · 89 / 87595 = 0.1% Aug 30 · 86 / 100858 = 0.1% Aug 31 · 85 / 100723 = 0.1% Sep 1 · 100 / 103985 = 0.1% Sep 2 · 73 / 110213 = 0.1% Sep 3 · 96 / 104103 = 0.1% Sep 4 · 84 / 99224 = 0.1% Sep 5 · 112 / 103527 = 0.1% Sep 6 · 101 / 90017 = 0.1% Sep 7 · 56 / 81727 = 0.1% Sep 8 · 66 / 73579 = 0.1% Sep 9 · 81 / 70080 = 0.1% Sep 10 · 42 / 74864 = 0.1% Sep 11 · 71 / 79438 = 0.1% Sep 12 · 44 / 52567 = 0.1% Sep 13 · 40 / 54571 = 0.1% Sep 14 · 37 / 55361 = 0.1% Sep 15 · 44 / 57578 = 0.1% Sep 16 · 47 / 59442 = 0.1% Sep 17 · 28 / 57565 = 0.0% Sep 18 · 31 / 53735 = 0.1% Sep 19 · 29 / 45666 = 0.1% Sep 20 · 42 / 45109 = 0.1% Sep 21 · 43 / 51994 = 0.1% Sep 22 · 49 / 55769 = 0.1% Sep 23 · 33 / 58380 = 0.1% Sep 24 · 42 / 53524 = 0.1% Sep 25 · 33 / 51389 = 0.1% Sep 26 · 56 / 102357 = 0.1% Sep 27 · 42 / 52891 = 0.1% Sep 28 · 30 / 61089 = 0.0% Sep 29 · 63 / 78237 = 0.1% Sep 30 · 57 / 69495 = 0.1% Oct 1 · 39 / 68697 = 0.1% Oct 2 · 41 / 63955 = 0.1% Oct 3 · 33 / 52999 = 0.1% Oct 4 · 43 / 51304 = 0.1% Oct 5 · 28 / 62890 = 0.0% Oct 6 · 36 / 65131 = 0.1%
Jun 1, 2026 90 days Oct 6, 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 14.38% 34.83%
#2 – React Router 6.68% 16.18%
#3 – Motion 6.13% 14.84%
#4 – TanStack Router 4.36% 10.57%
#5 – Swiper 3.54% 8.58%
…
#68 ▲1 Day.js Current page 0.08% 0.19%

Percentages show adoption among indie launches: the share of all analysed launches, and of launches using any Javascript Library tool.Day.js is typically used alongside jQuery rather than instead of it. All 1462 in Javascript Library →

Often used with

Tool Sites
jQuery 2,778
Google Fonts 2,459
HTTP/3 2,295
Cloudflare 2,105
HSTS 1,356

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

Recent launches we can show

41 of the 3,951 sites using Day.js are product launches we list individually. The other 3,910 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

Screenshot of moshpit | moshr, a launch using Day.js moshpit | moshr Oct 4, 2026 · score 1.2 Hervé Téguia Oct 3, 2026 Design Ampere AI Mötesbokning Sep 29, 2026 Screenshot of Online Authenticator, a launch using Day.js Online Authenticator Sep 28, 2026 · score 5.0 Developer Tools Candidus : l’entraide pour trouver du travail, avec l’IA Sep 28, 2026 BlizzNux Sep 27, 2026 Games Screenshot of Fast Gas, Heating & Plumbing Services , a launch using Day.js Fast Gas, Heating & Plumbing Services Sep 22, 2026 · score 3.6 Screenshot of The AI Agent Studio for Go-To-Market — Zrevick, a launch using Day.js The AI Agent Studio for Go-To-Market — Zrevick Sep 20, 2026 · score 7.4 WoWcraft Sep 17, 2026 Games Screenshot of RunHTML - preview and share html page, a launch using Day.js RunHTML - preview and share html page Sep 14, 2026 · score 5.4 Developer Tools قطع — سوق قطع غيار السيارات السعودي | Qita' Auto Parts Marketplace Sep 11, 2026 Entreluma — Interactive storytelling with Markdown Sep 11, 2026 Content

Showing the most recent 12 of 41.

The StackScope API serves all 3,951 sites using Day.js, filterable and exportable, from £15 a month.

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