jQuery UI
2,739,531 websites

jQuery UI is free to use

http://jqueryui.com/

jQuery UI is a curated set of user interface interactions, effects, widgets, and themes built on top of the jQuery JavaScript Library. Whether you're building highly interactive web applications or you just need to add a date picker to a fo...

VS

Modernizr
3,312,898 websites

Modernizr is free to use

http://modernizr.com/

Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser and allows you to target specific browser functionality in your stylesheet.

Market Share by Top Websites

1 Modernizr is leading in The Entire Web.

2 jQuery UI is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.

Websites Categories

1 jQuery UI has better usage coverage in more websites categories. Including Science & Education, Travel & Tourism, Law & Government, E-commerce & Shopping and 10 other categories.

2 Modernizr is leading in Computers Electronics & Technology, Arts & Entertainment, Health, Food & Drink and 6 other categories.

Geography

1 Modernizr is leading in most countries, including United States, Germany, United Kingdom, Canada and 131 other countries.

2 jQuery UI is leading in Russia, South Korea, Japan, China and 27 other countries.