Is Foundation or W3.CSS more popular?

Foundation is used by more websites in our catalog: 8,731 use Foundation and 1,051 use W3.CSS.

Does Foundation or W3.CSS have higher-authority sites?

Foundation sites have the higher median Ahrefs Domain Rating (Foundation: 32, W3.CSS: 23).

Is Foundation or W3.CSS growing faster?

Between 2026-06 and 2026-07, Foundation went from 1.1% to 0.99% of all tracked sites, while W3.CSS went from 0.13% to 0.12%. W3.CSS is gaining ground faster in our index.

How many sites use both Foundation and W3.CSS?

9 websites in our catalog use both Foundation and W3.CSS.

Where does this Foundation vs W3.CSS data come from?

Adoption is counted from Site Stats Database's own crawl; Domain Rating comes from Ahrefs and traffic from DataForSEO. Figures reflect the sites we track and refresh at least monthly.

Foundation vs W3.CSS — Site Stats Database

Foundation vs W3.CSS

A side-by-side comparison of two ui & css frameworks, based on the 204,967 UI Framework sites tracked by Site Stats Database.

Last updated July 1, 2026

Metric	Foundation	W3.CSS
Websites	8,731	1,051
Market share	4.3%	0.51%
Share of top 10K sites	0.84%	0.10%

Rank	#4	#12

Median DR	32	23

Average DR	34	26

Median keywords	1,025	810

Median referring domains	415	274

Median domain age	17 yrs	15 yrs

Average domain age	17 yrs	16 yrs

Average monthly traffic	69,054	76,577

Combined monthly traffic	602,914,005	80,482,793

patriots.com
LanguageEnglish
DR (Ahrefs)75
Total Keywords143,244
Referring Domains16,324
Domain Age31 yrs
Traffic (Jun 2026)21,987,794
Traffic Trend
TechnologyFoundation
uhaul.com
LanguageEnglish
DR (Ahrefs)82
Total Keywords286,557
Referring Domains21,818
Domain Age31 yrs
Traffic (Jun 2026)20,054,396
Traffic Trend
TechnologyFoundation
nyctourism.com
LanguageEnglish
DR (Ahrefs)80
Total Keywords240,750
Referring Domains21,150
Domain Age27 yrs
Traffic (Jun 2026)16,941,041
Traffic Trend
Technology
uber.com
LanguageEnglish
DR (Ahrefs)91
Total Keywords401,357
Referring Domains121,270
Domain Age30 yrs
Traffic (Jun 2026)14,692,510
Traffic Trend
TechnologyFoundation
texaslottery.com
LanguageEnglish
DR (Ahrefs)80
Total Keywords57,299
Referring Domains7,352
Domain Age26 yrs
Traffic (Jun 2026)12,469,549
Traffic Trend
Technology
photo.walgreens.com
LanguageEnglish
DR (Ahrefs)85
Total Keywords109,015
Referring Domains4,546
Domain Age31 yrs
Traffic (Jun 2026)10,619,614
Traffic Trend
Technology
bandcamp.com
LanguageEnglish
DR (Ahrefs)93
Total Keywords668,672
Referring Domains555,755
Domain Age23 yrs
Traffic (Jun 2026)10,045,944
Traffic Trend
Technology
canvaslms.com
LanguageEnglish
DR (Ahrefs)80
Total Keywords5,426
Referring Domains13,632
Domain Age15 yrs
Traffic (Jun 2026)9,394,607
Traffic Trend
Technology
mapsofworld.com
LanguageEnglish
DR (Ahrefs)70
Total Keywords512,560
Referring Domains28,794
Domain Age26 yrs
Traffic (Jun 2026)8,853,604
Traffic Trend
Technology
visitgreenvillesc.com
LanguageEnglish
DR (Ahrefs)70
Total Keywords41,971
Referring Domains2,959
Domain Age14 yrs
Traffic (Jun 2026)8,191,263
Traffic Trend
Technology

Website	Language	DR (Ahrefs)	Total Keywords	Referring Domains	Domain Age	Traffic (Jun 2026)	Traffic Trend	Technology
patriots.com	English	75	143,244	16,324	31 yrs	21,987,794		Foundation

tcgplayer.com
LanguageEnglish
DR (Ahrefs)82
Total Keywords534,734
Referring Domains19,103
Domain Age21 yrs
Traffic (Jun 2026)21,710,744
Traffic Trend
TechnologyW3.CSS
w3schools.com
LanguageEnglish
DR (Ahrefs)92
Total Keywords460,584
Referring Domains130,164
Domain Age26 yrs
Traffic (Jun 2026)19,645,294
Traffic Trend
Technology
skyward.com
Language
DR (Ahrefs)72
Total Keywords14,088
Referring Domains2,518
Domain Age30 yrs
Traffic (Jun 2026)2,570,806
Traffic Trend
TechnologyW3.CSS
purplemath.com
LanguageEnglish
DR (Ahrefs)70
Total Keywords67,496
Referring Domains4,507
Domain Age26 yrs
Traffic (Jun 2026)2,543,656
Traffic Trend
Technology
snapon.com
LanguageDutch
DR (Ahrefs)76
Total Keywords88,974
Referring Domains8,600
Domain Age31 yrs
Traffic (Jun 2026)2,452,232
Traffic Trend
TechnologyW3.CSS
mycutegraphics.com
LanguageEnglish
DR (Ahrefs)46
Total Keywords30,874
Referring Domains6,196
Domain Age20 yrs
Traffic (Jun 2026)2,322,689
Traffic Trend
Technology
everydaycalculation.com
LanguageEnglish
DR (Ahrefs)43
Total Keywords133,024
Referring Domains1,203
Domain Age13 yrs
Traffic (Jun 2026)2,256,594
Traffic Trend
Technology
miniwebtool.com
LanguageEnglish
DR (Ahrefs)70
Total Keywords157,726
Referring Domains5,437
Domain Age16 yrs
Traffic (Jun 2026)2,045,403
Traffic Trend
Technology
shedsforlessdirect.com
LanguageEnglish
DR (Ahrefs)26
Total Keywords20,031
Referring Domains1,662
Domain Age19 yrs
Traffic (Jun 2026)948,401
Traffic Trend
Technology
zinus.com
LanguageEnglish
DR (Ahrefs)64
Total Keywords13,871
Referring Domains1,959
Domain Age26 yrs
Traffic (Jun 2026)888,666
Traffic Trend
TechnologyW3.CSS