🆚 Fastly Polyfill vs. Polyfill

📈 Polyfill is much more popular than Fastly Polyfill.
🌍 Polyfill is more popular in all countries.

Statistics based on 3.8M+ analyzed websites. About this data

Fastly Polyfill

Polyfill

Type

JavaScript library

About

Fastly Polyfill is a service that reads the User-Agent header of each request and returns polyfills appropriate for the requesting browser.

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

It was originally owned by the Financial Times web team, then moved under community management, and 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 and Fastly.

Headquarters

London, United Kingdom

Website

polyfill-fastly.io

Pricing

Free ✔️ Open source

Popularity

Determined by the number of sites using each technology.

The Polyfill JavaScript library is 42 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.

Polyfill is more popular than Fastly Polyfill in all countries.

United States

Russia

Japan

United Kingdom

Spain

Italy

France

Germany

Australia

Netherlands

Awards

⬆️ 87th most popular in Canada in the JavaScript Libraries category.
⬆️ 91st most popular in Sweden in the JavaScript Libraries category.
⬆️ 94th most popular in Australia in the JavaScript Libraries category.
⬆️ 96th most popular in Denmark in the JavaScript Libraries category.
⬆️ 98th most popular in Ireland 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.
🥉 Third most popular in Switzerland in the JavaScript Libraries category.
🥉 Third most popular in Kazakhstan in the JavaScript Libraries category.
⭐ 4th most popular in the United Kingdom in the JavaScript Libraries category.

Popularity by domain category

Determined by the number of sites in each category.

Polyfill is more popular than Fastly Polyfill in all market segments.

Business

Marketing/Merchandising

Online Shopping

Education/Reference

Blogs/Wiki

Internet Services

Travel

Health

Entertainment

Non-Profit/Advocacy/NGO

Top sites

Top-ranked sites that use these technologies.

Name

Rank

#182

#544

#587

#1,063

#2,213

Name

Rank

#19

#38

#55

#83

#90