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...

VS

Polyfill.io
757,000 websites

Polyfill.io is free to use

https://polyfill.io/v3/

Polyfill is a service which accepts a request for a set of browser features and returns only the polyfills that are needed by the requesting browser.

Market Share by Top Websites

1 Backbone.js is leading in The Entire Web.

2 Polyfill.io is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.

Websites Categories

1 Backbone.js has better usage coverage in more websites categories. Including Arts & Entertainment, Games, Adult, Lifestyle and 16 other categories.

2 Polyfill.io is leading in Law & Government, Business & Consumer Services, Travel & Tourism and E-commerce & Shopping.

Geography

1 Polyfill.io is leading in most countries, including United States, United Kingdom, Canada, Japan and 105 other countries.

2 Backbone.js is leading in Germany, Italy, Spain, Russia and 50 other countries.