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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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 Polyfill.io 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 Errorception has better usage coverage in more websites categories. Including Arts & Entertainment, Adult, Games, News & Media and 12 other categories.

2 Polyfill.io is leading in Computers Electronics & Technology, Lifestyle, Law & Government, Business & Consumer Services and 4 other categories.

Geography

1 Polyfill.io is leading in most countries, including United States, United Kingdom, Canada, Japan and 156 other countries.

2 Errorception is leading in Russia, Taiwan, Belarus, French Guiana and one other country.