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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Errorception
409,111 websites

Errorception offers both free and paid options

http://errorception.com

Errorception is a error reporting service for client-side in-browser JavaScript errors. Client-side JavaScript errors occur in the end-users' browsers. It is very hard to find out about them, since logs of such errors are lost. Errorcept...

Market Share by Top Websites

1 Backbone.js is leading in Top 1M Sites and The Entire Web.

2 Errorception is leading in Top 10K Sites and Top 100K Sites.

Websites Categories

1 Backbone.js has better usage coverage in more websites categories. Including Arts & Entertainment, Games, Adult, Lifestyle and 12 other categories.

2 Errorception is leading in News & Media, Food & Drink, Sports, Travel & Tourism and 4 other categories.

Geography

1 Backbone.js is leading in most countries, including United States, United Kingdom, Canada, Germany and 158 other countries.

2 Errorception is leading in Russia, Taiwan and Macao.