CSS frameworks market share on brand websites

Utility and component CSS libraries.

#	Technology	UK brands	United Kingdom	Global
1	Bootstrap	29%	33%	25%
2	Tailwind CSS	14%	11%	11%
3	MUI	1.3%	0.4%	0.7%
4	Foundation	1%	1%	0.5%
5	Chakra UI	0.5%	0.1%	0.2%
6	UIkit	0.1%	0.3%	0.3%
7	Bulma	0%	<0.1%	<0.1%

By site popularity

Share of measured sites in each Tranco popularity band that use the technology: the top 1,000, 10,000 and 100,000 sites and the whole top million.

#	Technology	Top 1K	Top 10K	Top 100K	Top 1M
1	Bootstrap	18%	15%	26%	27%
2	Tailwind CSS	11%	11%	12%	13%
3	MUI	0%	0.7%	1.8%	1.6%
4	Chakra UI	0%	0%	0.8%	0.9%
5	Foundation	0%	0%	0.6%	0.6%
	Sites measured	38	136	503	689

Our crawler: 1,359 sites · UK brands · updated 23 Oct 2026 · Methodology