🆚 Core-js vs. Fastly Polyfill
- 📈 Core-js is three times more popular than Fastly Polyfill.
- 🌎 Core-js is more popular in the United States, the United Kingdom, and Japan.
- 🌍 Fastly Polyfill is more popular in Pakistan and Kuwait.
Statistics based on 3.3M+ analyzed websites. About this data
Core-js
Fastly PolyfillType
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.
Fastly Polyfill is a service that reads the User-Agent header of each request and returns polyfills appropriate for the requesting browser.
Pricing
Free ✔️Open source
Free ✔️Open source
Categories
JavaScript Libraries › Rank #50
JavaScript Libraries › Rank #100
Popularity
Determined by the number of sites using each technology.
The Core-js JavaScript library is 2.8 times more popular than Fastly Polyfill.
Total websites
Market share
JavaScript Libraries
Popularity by country
Determined by the number of sites detected from each country.
Core-js is more popular in the United States, the United Kingdom, and Japan, while Fastly Polyfill is more popular in Pakistan and Kuwait.
United States
United Kingdom
Japan
Germany
Canada
Australia
Brazil
France
India
Italy
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.
- ⬆️ 71st most popular in New Zealand in the JavaScript Libraries category.
- ⬆️ 76th most popular in Canada in the JavaScript Libraries category.
- ⬆️ 77th most popular in Brazil in the JavaScript Libraries category.
- ⬆️ 78th most popular in Norway in the JavaScript Libraries category.
- ⬆️ 79th most popular in Israel in the JavaScript Libraries category.
Popularity by domain category
Determined by the number of sites in each category.
Core-js is more popular among sites focused on business, marketing and merchandising, and blogs and wiki, while Fastly Polyfill is more commonly used on online shopping, fashion and beauty, and general news sites.
Business
Marketing/Merchandising
Online Shopping
Blogs/Wiki
Education/Reference
Entertainment
Health
Sports
Travel
Fashion/Beauty
Top sites
Top-ranked sites that use these technologies.
Compare alternatives
Technologies with similar characteristics.
Polyfill
Regenerator
Picturefill
Babel
jQuery🗃️ About This Data
- We evaluate the popularity of technologies based on the number of websites where we detect their usage.
- Technologies without a detectable web footprint, and those we do not track, are not reflected in the calculated market share.
- This report is based on the analysis of 3,375,483 websites.
- Statistics were last calculated on .
- For more details, see our methodology and disclaimer.