Article · Wikipedia archive · Last revised Jun 10, 2026

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.

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Jun 10, 2026
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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 151 Yes No 15.0.874.8
12 Sep 2011 		8 (10) Complex C++, WebKit JavaScript, HTML5 No Yes Yes Yes No No, No No Yes No No ≥ 16 MB
(memory-limited?)
Google Chrome 161 Yes No 16.0.912
13 Dec 2011 		13 (17/RFC 6455) Complex C++, WebKit JavaScript, HTML5 No Yes Yes Yes No No, No No Yes No No ≥ 16 MB
(memory-limited?)
Mozilla Firefox 72 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 112 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 WS3 Yes Yes 2.17
17 June 2014 		RFC 6455 Commercial C++ C++, JavaScript Yes Yes Yes Yes Yes Yes Yes No No Yes 2^16
Kaazing WebSocket Gateway4 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
Lightstreamer5 Yes Yes 7.4.7
12 Jun 2025 		RFC 6455 Commercial, freeware Java JavaScript, Android, Java, Swift, iOS, macOS, tvOS, watchOS, visionOS, .NET Standard, C++, Python, Flash/Flex, Silverlight, J2ME Yes Yes No Yes No No Yes Yes Yes No Data driven, configurable
MigratoryData6 Yes Yes 6.0.5
29 Aug 2021 		RFC 6455 Commercial Java JavaScript, iOS, Android, Java, C++, .NET, PHP, Node.js, Python Yes Yes No Yes No No, No Yes Yes Yes No 263, configurable
Mongoose7 Yes Yes 7.9
24 Jan 2023 		RFC 6455 GPL, commercial C/C++ C/C++ Yes Yes Yes Yes Yes Yes Yes Yes No Yes 263, configurable
noPoll8 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++ Libraries9 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
PowerWebSockets10 Yes Yes 15.176.5188
26 Jun 2015 		RFC 6455 Test report11 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
QtWebSockets12 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
RingSocket13 No Yes 1.0
13 Sep 2019 		RFC 6455 MIT C C Yes Yes Yes Yes No No Yes Yes No No unlimited/configurable
Resin14 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
WebSocketListener15 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
Wt16 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.NET17 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 Gateway18 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
μWebSockets19 No Yes v0.14.0
28 Mar 2017 		RFC 6455 Test report20 Apache License 2.0 C++, epoll, Libuv, Boost Asio C++, JavaScript, Node.js Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes memory-limited, configurable, server focused missing client support21
Boost.Beast22 Yes Yes 94
30 July 2017 		RFC 6455 Test report23 Boost C++, Boost Asio C++ Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes unlimited (packets streamed to user code), permessage-deflate also unlimited (chunked)
libwebsockets24 Yes Yes 2.4
16 Oct 2017 		RFC 6455 + RFC 7692 Test report25 LGPL2 + SLE C, libuv, libev , libevent, poll, external poll loop integration, OpenSSL, mbedTLS 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++26 Yes Yes 0.8.2
20 Apr, 2020 		RFC 6455 BSD C++11 C++11 ? ? ? ? ? ? ? ? ? ? ?
facil.io27 Yes Yes 0.7.1
18 May 2019 		RFC 6455 MIT C C Yes Yes Yes Yes Yes Yes, yes Yes Yes Yes Yes configurable client to server limits. unlimited (chunked) server to client.
oatpp-websocket28 Yes Yes 1.3.0
19 Nov 2021 		RFC 6455 Apache License 2.0 C++11, Oat++ C++11, Oat++ Yes Yes Yes Yes Yes Yes Yes No No Yes unlimited (packets streamed to user code)
Notes

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