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Side-by-side comparison

Pick up to four tools and compare adoption, momentum and maintenance at a glance. The crown marks the leader in each row.

ASP.NET Core library for real-time hubs over WebSockets with automatic transport fallbacks.

Bidirectional real-time events over WebSocket with fallbacks, rooms and auto-reconnect.

Fast, thoroughly tested WebSocket client and server for Node.js.

C++-backed WebSocket and HTTP server for Node.js tuned for very high connection counts.

Head to head

Metric	SignalR	Socket.IO	ws	uWebSockets.js
Stars	n/a	63.2k	22.8k	9.2k
Weekly downloads	2.6M	21.2M	400M	n/a
Download growth	+28%	+27%	+28%	n/a
Popularity score	78/100	89/100	91/100	72/100
Forks	n/a	10.2k	2.7k	626
Open issues	n/a	189	10	22
Last commit	n/a	6d ago	3d ago	3w ago
Latest version	11.0.0	4.8.4	8.22.2	n/a
License	n/a	MIT	MIT	Apache-2.0
First released	n/a	2010	2011	2018
Signals	Popular	Popular	Popular	None
Listed in	Backend › Real-time & WebSockets	Frontend › Real-time, Sync & Collaboration Backend › Real-time & WebSockets	Backend › Real-time & WebSockets	Backend › Real-time & WebSockets

Hover for exact values; switch to log scale for tools of very different sizes. Not shown (no comparable download data): uWebSockets.js.

ASP.NET Core library for real-time hubs over WebSockets with automatic transport fallbacks.

Bidirectional real-time events over WebSocket with fallbacks, rooms and auto-reconnect.

Fast, thoroughly tested WebSocket client and server for Node.js.

C++-backed WebSocket and HTTP server for Node.js tuned for very high connection counts.

Metric	SignalR	Socket.IO	ws	uWebSockets.js
Stars	n/a	63.2k	22.8k	9.2k
Weekly downloads	2.6M	21.2M	400M	n/a
Download growth	+28%	+27%	+28%	n/a
Popularity score	78/100	89/100	91/100	72/100
Forks	n/a	10.2k	2.7k	626
Open issues	n/a	189	10	22
Last commit	n/a	6d ago	3d ago	3w ago
Latest version	11.0.0	4.8.4	8.22.2	n/a
License	n/a	MIT	MIT	Apache-2.0
First released	n/a	2010	2011	2018
Signals	Popular	Popular	Popular	None
Listed in	Backend › Real-time & WebSockets	Frontend › Real-time, Sync & Collaboration Backend › Real-time & WebSockets	Backend › Real-time & WebSockets	Backend › Real-time & WebSockets

Hover for exact values; switch to log scale for tools of very different sizes. Not shown (no comparable download data): uWebSockets.js.