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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Bootstrap
3,827,401 websites

Bootstrap is free to use

http://getbootstrap.com/

Sleek, intuitive, and powerful mobile first front-end framework for faster and easier web development.

Market Share by Top Websites

1 Bootstrap 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 Bootstrap in all segments.

Websites Categories

1 Bootstrap has better usage coverage in more websites categories. Including Computers Electronics & Technology, Science & Education, Law & Government, Health and 17 other categories.

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

Geography

1 Bootstrap is leading in most countries, including United States, Russia, India, China and 162 other countries.

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