Core-js

Core-js is a modular standard library for JavaScript that provides polyfills for ECMAScript up to 2024: promises, symbols, collections, iterators, typed arrays, and proposals.

According to our data, Core-js ranks 51th among the JavaScript libraries we track.
It has 1.1% of the JavaScript library market share and is detected on 0.8% of all websites.

💸 Pricing

Core-js is available for free.

Free ✔️Open source

📊 Rankings and Market Share

🏆 Core-Js Awards

⚡ Sites Using Core-Js

We have data on 25,476 websites that use the Core-js JavaScript library. Here is a list of some of the top ranked ones.

The highest rated site using Core-js is mail.ru.

#WebsiteRankCountryLanguage
1 mail.ru #123 Russia Russian
2 avito.ru #207 Russia Russian
3 bestbuy.com #254 United States American English
4 wiki.gg #1,184 English
5 wix.com #1,300 English
6 smh.com.au #1,536 Australia English
7 oregon.gov #1,617 United States American English
8 raiplay.it #1,711 Italy Italian
9 nespresso.com #1,826 Switzerland English
10 next.co.uk #2,092 United Kingdom British English
11 work.ua #2,172 Ukraine Ukrainian
12 mixi.jp #2,229 Japan Japanese
13 rainews.it #2,663 Italy Italian
14 sydney.edu.au #2,741 Australia American English
15 paciolan.com #3,104 United States English
16 yummyani.me #3,452 Russia Russian
17 vipbox.lc #3,953 Seychelles English
18 ukrainealarm.com #4,020 Ukrainian
19 dmac-solutions.net #4,052 United States English
20 theage.com.au #4,840 Australia English

📈 Usage Statistics

Most of the sites that use Core-js:

Most of the sites using Core-js are from the United States and the United Kingdom.

  • United States 28.4%
  • United Kingdom 7.9%
  • Japan 4.9%
  • Germany 4.8%
  • Canada 4.4%
  • Brazil 4.2%
  • Australia 4%
  • France 3.5%
  • India 2.4%
  • Other 35.5%

Most Core-js users speak English, German, or Spanish.

  • English 68.8%
  • German 5.1%
  • Spanish 3.9%
  • Japanese 3.6%
  • Portuguese 3.6%
  • French 3.5%
  • Italian 1.6%
  • Dutch 1.4%
  • Russian 0.9%
  • Other 7.6%

The Core-js JavaScript library is especially popular on .com and .org top-level domains.

  • .com 51.5%
  • .org 10%
  • .co.uk 2.9%
  • .de 2.5%
  • .com.br 2.4%
  • .net 2.3%
  • .com.au 2.1%
  • .ca 1.6%
  • .ch 1.4%
  • Other 23.3%

The primary market segments for websites utilizing Core-js include business, marketing and merchandising, and blogs and wiki.

  • Business 18.5%
  • Marketing/Merchandising 13.9%
  • Blogs/Wiki 6.7%
  • Education/Reference 5.5%
  • Entertainment 5.1%
  • Online Shopping 4.2%
  • Travel 3.7%
  • Sports 3.7%
  • Motor Vehicles 3.5%
  • Other 35.2%

🔢 Core-Js Versions

The most popular version of Core-Js is 3.2, used by 98.1% of sites where versions were detected. In addition, 0.9% of sites use Core-Js 2.4, and 0.2% use Core-Js 2.6.

  • 3.2 98.1%
  • 2.4 0.9%
  • 2.6 0.2%
  • 2.5 0.09%
  • 3.6 0.08%
  • 3.1 0.08%
  • 3.21 0.06%
  • 3.28 0.06%
  • 3.16 0.05%
  • Other 0.4%

🕵️ Similar Technologies

These are some of the best Core-js alternatives.

RankName
4
Polyfill

An open-source JavaScript library that provides modern web API features to older browsers that do not natively support them.

FreeOpen source
22
Regenerator
Menlo Park, California, United States

A JavaScript library from Facebook that allows the use of ES6 generators in older browsers.

FreeOpen source
97
Fastly Polyfill

A service that reads the User-Agent header of each request and returns polyfills appropriate for the requesting browser.

FreeOpen source
117
Babel

A JavaScript compiler mainly used to convert ECMAScript 2015+ (ES6) code into an older JavaScript (ES5) version to maximize browser compatibility.

FreeOpen source
254
ES6 Shim

Provides compatibility shims so that legacy JavaScript engines behave as closely as possible to ECMAScript 6.

FreeOpen sourceLegacy

🆚 Compare Alternatives

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💬 Frequently Asked Questions

Is Core-js free?

Yes, it is a free JavaScript library.

Which country uses Core-js the most?

The majority of Core-js users are from the United States.

Who uses Core-js?

According to our data, Core-js is used on thousands of sites, including such established ones as mail.ru, avito.ru, and bestbuy.com.

Is Core-js used on government websites?

Yes, for example, it is used by oregon.gov. In total, we found Core-js on 17 government sites in the United States.

Do academic institutions use Core-js?

Yes. The most prominent of these is sydney.edu.au. Overall, we know of 17 academic websites in the United States that use Core-js.

How does Core-js compare to the competition?

Core-js is a fairly popular JavaScript library, ranking ahead of 259 other JavaScript libraries we track.

What are the alternatives to Core-js?

Alternatives and possible competitors to Core-js may include Polyfill, Regenerator, and Fastly Polyfill.

Statistics were last calculated on .
For details, see our methodology and disclaimer.