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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.

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

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

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

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

Head to head

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

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

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

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

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

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