Backbone.js
781,951 websites

Backbone.js is free to use

http://backbonejs.org/

Backbone.js gives structure to web applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions, views with declarative event handling, and connects it all to your existing A...

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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 Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.

2 In terms of market share, Backbone.js is clearly lagging behind, losing to Modernizr in all segments.

Websites Categories

1 Modernizr has better usage coverage in more websites categories. Including Science & Education, Computers Electronics & Technology, Health, Food & Drink and 17 other categories.

2 Backbone.js is leading in Arts & Entertainment, Games and Adult.

Geography

1 Modernizr is leading in most countries, including United States, Germany, United Kingdom, Canada and 162 other countries.

2 Backbone.js hasn't got a lead over Modernizr in any country.