🆚 Polyfill vs. Siema

Compare technologies based on real-world usage data *
Polyfill
Siema

Type

JavaScript library
JavaScript library

About

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.

Siema is a lightweight carousel with no dependencies and no styling.

Website

cdnjs.cloudflare.com/polyfill
pawelgrzybek.github.io/siema/

Pricing

Free ✔️Open source
Free ✔️Open source

Categories

JavaScript Libraries › Rank #4
JavaScript Libraries › Rank #234

Popularity

Determined by the number of sites using each technology.

The Polyfill JavaScript library is 472 times more popular than Siema.
Total websites

Market share

JavaScript Libraries

Popularity by country

Determined by the number of sites detected from each country.

Polyfill is more popular than Siema in all countries.
United States
United Kingdom
Japan
Russia
Spain
Germany
Italy
Australia
France
Netherlands

Awards

Popularity by domain category

Determined by the number of sites in each category.

Polyfill is more popular than Siema 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
#19
#36
#38
#55
#84
View more ➝
Name
Rank
#925
#2,231
#3,874
#10,092
#15,481
View more ➝

See also

* 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 .
For details, see our methodology and disclaimer.