Comparison of WebSocket implementations

The WebSocket protocol is implemented in different web browsers, web servers, and run-time environments and libraries acting as clients or servers. The following is a table of different features of notable WebSocket implementations.

Client (library) Server (library) Version compared Protocol (spec) version support Protocol test report License Implementation: language, environment API: language, environment Self-hosted server Text message support Binary message support API message-based API frame-based API streaming input-output Flow-control framework Automatic pongs for pings Automatic heartbeat pings Manual pings-pongs Frame size limit
Google Chrome 15[1] Yes No 15.0.874.8
12 Sep 2011		 8 (10) Complex C++, WebKit JavaScript, HTML5 No Yes No Yes No No, No No Yes No No ≥ 16 MB
(memory-limited?)
Google Chrome 16[1] Yes No 16.0.912
13 Dec 2011		 13 (17/RFC 6455) Complex C++, WebKit JavaScript, HTML5 No Yes No Yes No No, No No Yes No No ≥ 16 MB
(memory-limited?)
Mozilla Firefox 7[2] Yes No 7 beta
12 Sep 2011		 8 (10) MPL, GPL, LGPL C++, Necko JavaScript, HTML5 No Yes No Yes No No, No No Yes No No < 16 MB
Mozilla Firefox 11[2] Yes No 11.0
13 Mar 2012		 13 (17/RFC 6455) MPL, GPL, LGPL C++, Necko JavaScript, HTML5 No Yes Yes Yes No No, No No Yes No No < 2 GB
(memory-limited?)
Achex WS[3] Yes Yes 2.17
17 June 2014		 RFC 6455 BSD new C++ C++, JavaScript Yes Yes Yes Yes Yes Yes Yes No No Yes 2^16
Socket.IO[4] Yes Yes MIT JavaScript JavaScript
Kaazing WebSocket Gateway[5] Yes Yes 5.0 Dec 2014 RFC 6455 APL2 (Community Edition), commercial (Enterprise Edition) Java, JMS JavaScript, Flash/Flex, Silverlight, Objective-C & iOS, Java, Java & Android, .NET, Xamarin Yes Yes Yes Yes No Yes Yes Yes Yes No memory-limited, configurable
Lightstreamer[6] Yes Yes 6.1.0
23 Jan 2017		 RFC 6455 Commercial, freeware Java JavaScript, Flash/Flex, Silverlight, iOS, macOS, tvOS, Java, J2ME, Android, .NET PCL Yes Yes No Yes No No Yes Yes Yes No Data driven, configurable
MigratoryData[7] Yes Yes 5.0.15
13 Oct 2015		 RFC 6455 Commercial Java JavaScript, iOS, Android, Java, C++, .NET, PHP, Node.js, Python, Ruby Yes Yes No Yes No No, No Yes Yes Yes No 263, configurable
noPoll[8] Yes Yes 0.3.2
28 aug 2015		 RFC 6455 LGPL 2.1 ANSI C ANSI C Yes Yes Yes Yes Yes Yes No Yes Yes Yes memory-limited, configurable
POCO C++ Libraries[9] Yes Yes 1.4.6
23 Sep 2014		 RFC 6455 Boost C++, POCO C++ Libraries C++ Yes Yes Yes No Yes Yes No No No Yes memory-limited, configurable
PowerWebSockets[10] Yes Yes 15.176.5188
26 Jun 2015		 RFC 6455 Test report[11] Commercial .NET .NET Framework, .NET Compact Framework, Xamarin. iOS, Xamarin.Android, Windows Phone, Silverlight, Mono Yes Yes Yes Yes No Yes Yes Yes Yes Yes memory-limited, configurable
Push Technology Diffusion[12] Yes Yes 4.6.1 RFC 6455 Commercial Java JavaScript, Flash/Flex, Silverlight, Objective-C & iOS, Java, Java & Android, .NET, Java J2ME & BlackBerry, C/C++, Node.js Yes Yes Yes Yes No Yes Yes Yes[13] Yes[13] No memory-limited, configurable
QtWebSockets[14] Yes Yes 1.0
12 Nov 2013		 RFC 6455 LGPL C++, Qt Qt Yes Yes Yes Yes Yes No Yes Yes Yes Yes memory-limited, configurable
Resin[15] No Yes 4.026
29 Feb 2012		 RFC 6455 GPL, commercial Java, C Java Yes Yes Yes No Yes No Yes No No memory-limited, configurable
WebSocketListener[16] No Yes 2.1.3
24 Nov 2014		 RFC 6455 MIT .NET, Mono .NET, Mono Yes Yes Yes Yes No Yes Yes Yes Yes No Configurable
Wt[17] No Yes 3.2.0
30 Nov 2011		 0,7,8,13 (17) [? Report] GPL, commercial C++, Boost Asio C++ Yes Yes No No No Yes Yes Yes No memory-limited, configurable
XSockets.NET[18] Yes Yes 5.* RFC 6455 Commercial .NET Server-languages: Windows (.NET), Unix-Linux (Mono)

Client-languages: JavaScript, .NET, Mono

 Yes Yes Yes Yes No Yes Yes Yes Yes Yes memory-limited, configurable
RIWA Gateway[19] Yes Yes 2.01 RFC 6455 Commercial Java Java, Android, iOS, JavaScript Yes Yes Yes Yes No Yes No Yes No No memory-limited, configurable
Boost.Beast[20] Yes Yes 94
30 July 2017		 RFC 6455 Test report[21] Boost C++, Boost C++ Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes unlimited (packets streamed to user code), permessage-deflate also unlimited (chunked)
libwebsockets[22] Yes Yes 2.1-pre3
6 Sep 2016		 RFC 6455 + RFC 7692 Test report[23] LGPL2 + SLE C C, HTML5, JavaScript Yes Yes Yes Yes Yes Yes, yes Yes Yes Yes Yes unlimited (packets streamed to user code), permessage-deflate also unlimited (chunked)
websocket++[24] Yes Yes 0.7.0
22 Feb, 2016		 RFC 6455 BSD C++11 C++11 ? ? ? ? ? ? ? ? ? ? ?
facil.io[25] No Yes 0.4.2
2 Jun 2017		 RFC 6455 MIT C C Yes Yes Yes Yes Yes Yes, yes Yes Yes Yes Yes configurable client to server limits. unlimited (chucked) server to client.

Notes

  1. 1 2 Chromium website
  2. 1 2 Necko website
  3. ↑ Achex WS website
  4. ↑ Socket.IO website
  5. ↑ Kaazing website
  6. ↑ Lightstreamer website
  7. ↑ MigratoryData website
  8. ↑ noPoll website
  9. ↑ POCO C++ Libraries documentation
  10. ↑ PowerWebSockets website
  11. ↑ PowerWebSockets Autobahn|Testsuite report
  12. ↑ Push Technology website
  13. 1 2 Pings and heartbeats are defined in the Diffusion protocol layer
  14. ↑ QtWebSockets website
  15. ↑ Caucho website
  16. ↑ WebSocketListener website
  17. ↑ wt website
  18. ↑ XSockets.NET website
  19. ↑ RIWA website
  20. ↑ Boost.Beast (GitHub)
  21. ↑ Beast.WebSocket Autobahn|Testsuite report
  22. ↑ libwebsockets.org website
  23. ↑ libwebsockets.org lws Autobahn|Testsuite report
  24. ↑ websocket++ website
  25. ↑ facil.io website
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