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.

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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 Polyfill.io 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, Games, Arts & Entertainment and 19 other categories.

2 Polyfill.io is leading in Law & Government.

Geography

1 Require JS is leading in most countries, including Germany, China, Russia, Italy and 89 other countries.

2 Polyfill.io is leading in United States, United Kingdom, Canada, Japan and 66 other countries.