Comparison of WebSocket implementations This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources. Find sources: "Comparison of WebSocket implementations" – news · newspapers · books · scholar · JSTOR (September 2011) (Learn how and when to remove this message) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Comparison of WebSocket implementations" – news · newspapers · books · scholar · JSTOR (September 2011) (Learn how and when to remove this message) This article's factual accuracy may be compromised due to out-of-date information. Please help update this article to reflect recent events or newly available information. (March 2013) (Learn how and when to remove this message) 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 7.4.6 18 Feb 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 [Wikidata], 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) Notes ^ a b Chromium website ^ a b Necko website ^ Achex WS website ^ Kaazing website ^ Lightstreamer website ^ MigratoryData website ^ Mongoose Library website ^ noPoll website ^ POCO C++ Libraries documentation ^ PowerWebSockets website ^ PowerWebSockets Autobahn|Testsuite report ^ QtWebSockets website ^ RingSocket (GitHub) ^ Caucho website ^ WebSocketListener website ^ wt website ^ XSockets.NET website ^ RIWA website ^ μWebSockets (GitHub) ^ μWebSockets Autobahn|Testsuite report ^ Boost.Beast (GitHub) ^ Beast.WebSocket Autobahn|Testsuite report ^ libwebsockets.org website ^ libwebsockets.org lws Autobahn|Testsuite report ^ websocket++ website ^ facil.io website ^ oatpp.io website

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