🆚 Polyfill vs. SignalR

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.

Popularity

Determined by the number of sites using each technology.

• 🥈 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.

• ⬆️ 126th most popular in Vietnam in the JavaScript Libraries category.
• ⬆️ 130th most popular in Iran in the JavaScript Libraries category.
• ⬆️ 134th most popular in Denmark in the JavaScript Libraries category.
• ⬆️ 163rd most popular in Turkey in the JavaScript Libraries category.
• ⬆️ 191st most popular in Australia in the JavaScript Libraries category.

Top sites

Top-ranked sites that use these technologies.

Compare alternatives

Technologies with similar characteristics.

• Polyfill vs. Regenerator
• Polyfill vs. Core-js
• Polyfill vs. Fastly Polyfill
• Polyfill vs. Babel
• Polyfill vs. ES6 Shim

• SignalR vs. jQuery
• SignalR vs. 🍪 JS Cookie
• SignalR vs. Axios
• SignalR vs. Socket.io
• SignalR vs. WebTorrent

• Polyfill technology profile

• SignalR technology profile
• Microsoft company profile