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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.

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.

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

Head to head

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

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.

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

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