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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TrackJS
397,405 websites

TrackJS offers both free and paid options

https://trackjs.com/

JavaScript error detection app for detecting JS errors on customer visits.

Market Share by Top Websites

1 Backbone.js is leading in The Entire Web.

2 TrackJS 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 11 other categories.

2 TrackJS is leading in Computers Electronics & Technology, Business & Consumer Services, E-commerce & Shopping, Vehicles and 5 other categories.

Geography

1 Backbone.js is leading in most countries, including United States, United Kingdom, Canada, Germany and 136 other countries.

2 TrackJS is leading in China, Russia, Taiwan, Hong Kong and 22 other countries.