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	Yes	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	Yes	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		Commercial	C++	C++, JavaScript	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	No	Yes	2^16
Kaazing WebSocket Gateway[4]	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[5]	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
MigratoryData[6]	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
Mongoose[7]	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
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
QtWebSockets[12]	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
RingSocket[13]	No	Yes	1.0 13 Sep 2019	RFC 6455		MIT	C	C	Yes	Yes	Yes	Yes	No	No	Yes	Yes	No	No	unlimited/configurable
Resin[14]	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[15]	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[16]	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[17]	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[18]	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
μWebSockets[19]	No	Yes	v0.14.0 28 Mar 2017	RFC 6455	Test report[20]	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
Boost.Beast[21]	Yes	Yes	94 30 July 2017	RFC 6455	Test report[22]	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)
libwebsockets[23]	Yes	Yes	2.4 16 Oct 2017	RFC 6455 + RFC 7692	Test report[24]	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++[25]	Yes	Yes	0.8.2 20 Apr, 2020	RFC 6455		BSD	C++11	C++11	?	?	?	?	?	?	?	?	?	?	?
facil.io[26]	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-websocket[27]	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)