🆚 Core-js vs. Polyfill

Compare technologies based on real-world usage data *

📈 Polyfill is much more popular than Core-js.
🌎 Polyfill is more popular in the United States, the United Kingdom, and Japan.
🌍 Core-js is more popular in Saint Pierre and Miquelon.

Type

JavaScript library

JavaScript library

About

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.

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

After a supply chain attack in 2024 involving its cdn.polyfill.io domain, the service was discontinued and is now safely mirrored and maintained by Cloudflare under independent management.

Website

cdnjs.cloudflare.com/polyfill

Pricing

Free ✔️Open source

Free ✔️Open source

Categories

JavaScript Libraries › Rank #51

JavaScript Libraries › Rank #4

Popularity

Determined by the number of sites using each technology.

The Polyfill JavaScript library is 12 times more popular than Core-js.

Total websites

Market share

JavaScript Libraries

Popularity by country

Determined by the number of sites detected from each country.

Polyfill is more popular in the United States, the United Kingdom, and Japan, while Core-js is more popular in Saint Pierre and Miquelon.

United States

United Kingdom

Japan

Russia

Spain

Germany

Italy

Australia

France

Netherlands

Awards

⬆️ 41st most popular in Costa Rica in the JavaScript Libraries category.
⬆️ 42nd most popular in Israel in the JavaScript Libraries category.
⬆️ 44th most popular in Switzerland in the JavaScript Libraries category.
⬆️ 45th most popular in Canada in the JavaScript Libraries category.
⬆️ 45th most popular in New Zealand in the JavaScript Libraries category.

🥈 Second most popular in Russia in the JavaScript Libraries category.
🥈 Second most popular in Belarus in the JavaScript Libraries category.
🥈 Second most popular in Jamaica in the JavaScript Libraries category.
🥈 Second most popular in Curacao in the JavaScript Libraries category.
🥈 Second most popular in the Turks and Caicos Islands in the JavaScript Libraries category.

Popularity by domain category

Determined by the number of sites in each category.

Polyfill is more popular than Core-js in all market segments.

Business

Marketing/Merchandising

Online Shopping

Education/Reference

Blogs/Wiki

Internet Services

Travel

Entertainment

Health

Non-Profit/Advocacy/NGO

Top sites

Top-ranked sites that use these technologies.

Name

Rank

#123

#207

#254

#1,184

#1,300

Name

Rank

#19

#36

#38

theguardian.com

#55

#84

Compare alternatives

Technologies with similar characteristics.

See also

Core-js technology profile

Polyfill technology profile

* According to recent studies, many of online reviews are fake.
When making your decision, it is better to rely on data that cannot be falsified.
Our service evaluates the popularity of technologies by the number of websites using them.

Statistics were last calculated on March 20, 2026.
For details, see our methodology and disclaimer.