Ext JS
23,669 websites

Ext JS offers both free and paid options

https://www.sencha.com/products/extjs/#overview

Ext JS is a cross-browser JavaScript library for building rich internet applications.

VS

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...

Market Share by Top Websites

1 jQuery UI is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.

2 In terms of market share, Ext JS is clearly lagging behind, losing to jQuery UI in all segments.

Websites Categories

1 jQuery UI has better usage coverage in more websites categories. Including Science & Education, Computers Electronics & Technology, Health, Travel & Tourism and 20 other categories.

2 Ext JS hasn't got a lead over jQuery UI in any websites category.

Geography

1 jQuery UI is leading in most countries, including United States, Russia, Germany, South Korea and 162 other countries.

2 Ext JS hasn't got a lead over jQuery UI in any country.