Alternatives to WebSocket King

A web-based client for connecting to, testing and debugging WebSocket servers. The listings below can replace it for an important use case. Each note says what changes if you switch.

  • WebSocket King

    A web-based client for connecting to, testing and debugging WebSocket servers.

    FreeProprietaryWeb

Replacements

Listings that take over the same core job as WebSocket King.

  • Hoppscotch

    A fast API client that runs in a browser tab, with a self-hostable workspace if you want one.

    FreemiumOpen sourceWindowsmacOSLinuxWebSelf-hosted

    Hoppscotch also runs in a browser tab with nothing to install, is open source under MIT, and adds HTTP, GraphQL, Server-Sent Events, Socket.IO and MQTT to WebSocket testing.

  • Firecamp

    An open-source API client for testing REST, GraphQL, WebSocket and Socket.IO requests in the browser.

    FreeOpen sourceWeb

    Firecamp is an open-source browser client handling WebSocket and Socket.IO alongside REST and GraphQL, with a guest mode, though saving collections requires an account.

  • websocat

    A command-line WebSocket client and server, like netcat or curl for ws:// with socat-style features.

    FreeOpen sourceCommand line

    websocat moves WebSocket testing to an open-source command-line client and server that works in pipes and shell scripts, with socat-style bridging to other streams.

  • Insomnia

    An API client for REST, GraphQL and gRPC that can keep everything local or sync through Git instead of a cloud.

    FreemiumOpen sourceWindowsmacOSLinux

    Insomnia is an open-source desktop client that supports WebSockets along with REST, GraphQL, gRPC and SSE, requiring installation rather than running in the browser.

  • Yaak

    An offline-first API client for REST, GraphQL, gRPC, WebSockets and SSE, with requests stored as files you can commit to git.

    FreemiumOpen sourceWindowsmacOSLinux

    Yaak is an open-source offline desktop client covering WebSockets plus REST, GraphQL, gRPC and SSE, storing requests as files you can commit to git.

  • Bruno

    An API client that saves collections as plain files in a folder, so Git handles the sharing instead of a cloud account.

    FreemiumOpen sourceWindowsmacOSLinux

    Bruno is an open-source MIT desktop client supporting WebSocket, REST, GraphQL and gRPC, with collections kept as plain files shared through Git.

Similar software

Related functionality, not a direct replacement.