🆚 Polyfill vs. SignalR

Compare technologies based on real-world usage data *

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.

SignalR is a library for ASP.NET that enables real-time two-way communication between servers and clients.

It supports multiple transport methods (WebSockets, Server-Sent Events, long polling) with automatic negotiation, provides a Hub API for calling methods from server or client, handles connection lifecycle, supports groups and broadcast messaging, and scales via backplanes and Azure SignalR Service.

Headquarters

Redmond, Washington, United States

Website

Pricing

Free ✔️Open source
Free ✔️Open source

Categories

JavaScript Libraries › Rank #4
JavaScript Libraries › Rank #219

Popularity

Determined by the number of sites using each technology.

The Polyfill JavaScript library is 321 times more popular than SignalR.
Total websites

Market share

JavaScript Libraries

Popularity by country

Determined by the number of sites detected from each country.

Polyfill is more popular than SignalR 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 SignalR 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
View more ➝
Name
Rank
attheraces.com
#1,525
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.