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...

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Require JS
856,419 websites

Require JS is free to use

http://requirejs.org/

RequireJS is a JavaScript file and module loader. It is optimized for in-browser use, but it can be used in other JavaScript environments, like Rhino and Node.

Market Share by Top Websites

1 Require 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 Require JS has better usage coverage in more websites categories. Including Science & Education, Computers Electronics & Technology, Lifestyle, Health and 10 other categories.

2 Errorception is leading in Arts & Entertainment, Adult, Games, News & Media and 6 other categories.

Geography

1 Require JS is leading in most countries, including United States, Germany, United Kingdom, China and 160 other countries.

2 Errorception is leading in Taiwan and French Guiana.