How many companies use W3.CSS?

TechLeads currently detects W3.CSS on 15,841 websites. HTTP Archive's monthly crawl, a separate dataset, detected it on 28,534 pages in September 2026.

Who are W3.CSS's biggest competitors?

By number of websites, the largest UI frameworks technologies besides W3.CSS are Bootstrap (10,240,147), Tailwind CSS (1,469,184), Animate.css (967,962), UIKit (538,361), Radix UI (380,282).

Which companies use W3.CSS?

Websites using W3.CSS include uctv.tv, pypsa.org, bongoclass.com, historyworld.net, mapio.net, blahdns.com. The full list of 15,841 websites can be exported as a CSV for $29.

W3.CSS market share and customers

As of October 8, 2026, W3.CSS is used by 15,841 websites in the TechLeads index: 0.10% of all UI frameworks detections, the 21st most-used of 77 UI frameworks technologies.

15,841

websites using W3.CSS

0.10%

share of UI frameworks

#21

of 77 in UI frameworks

Cite this data

Quoting these numbers? Credit TechLeads with a link to this page.

Citation

TechLeads. "W3.CSS Customers and Market Share." Data as of October 8, 2026. https://techleads.fyi/technology/w3-css/market-share

HTML link

<a href="https://techleads.fyi/technology/w3-css/market-share">W3.CSS market share (TechLeads data)</a>

W3.CSS vs competitors in UI frameworks

Websites using each technology in the TechLeads index, and its share of all UI frameworks detections.

#	Technology	Websites	Share
1	Bootstrap	10,240,147	67.6%
2	Tailwind CSS	1,469,184	9.7%
3	Animate.css	967,962	6.4%
4	UIKit	538,361	3.6%
5	Radix UI	380,282	2.5%
6	ZURB Foundation	325,985	2.2%
7	shadcn/ui

W3.CSS usage over time

In HTTP Archive's monthly crawl of public websites, W3.CSS was detected on 28,534 pages in September 2026, down 18.6% from a year earlier (peak: 44,455). HTTP Archive is a separate dataset from the TechLeads index, so its numbers are not added to ours.

Same month, other UI Frameworks technologies in HTTP Archive: Bootstrap 12,662,985, Tailwind CSS 3,462,723, Animate.css 1,731,531, Radix UI 990,535, ZURB Foundation 748,793.

Companies using W3.CSS

uctv.tv
pypsa.org
bongoclass.com
historyworld.net
mapio.net · Mapio.net
blahdns.com · Blahdns
ddnp.hu
ntpark.rs
lighthousefriends.com
ghanadistricts.com
khiladiludo.com
bbmkuniv.in

See all 15,841 websites using W3.CSS or download the full list as a CSV for $29.

How these numbers are calculated

TechLeads scans public websites and detects W3.CSS from signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Market share is W3.CSS's website count divided by the website counts of all UI frameworks technologies we track; a site using two UI frameworks tools counts for both. Counts were last refreshed on October 8, 2026 and update daily.

FAQ

W3.CSS accounts for 0.10% of UI frameworks detections in the TechLeads index (15,841 websites), which makes it the 21st most-used of 77 UI frameworks technologies we track.