IconVault's WebSocket Sandbox is a live WebSocket client in your browser: enter any ws:// or wss:// endpoint, connect, send text messages, and watch every sent and received message appear in a timestamped log. It ships with a public echo server preset so you can test immediately, and an SSE mode for subscribing to Server-Sent Events streams too.

It is ideal for debugging APIs, chat backends, realtime dashboards and IoT endpoints without writing throwaway client code. Everything happens in your browser with no signup and no install, and it is free. Honest note: browser security rules mean you can only reach servers that accept the connection and, for wss, valid HTTPS contexts; mixed-content restrictions may block plain ws:// from a secure page.