Bytowl is a Postman-like desktop client for WebSocket, STOMP, and Socket.IO endpoints. Connect, send messages, write tests, record sessions, and stream audio — all in one app.
No more switching between tools. Bytowl speaks all major real-time protocols natively.
Connect to any WebSocket endpoint. Send text or binary messages. Watch live responses stream in.
Full STOMP 1.2 support with topic subscriptions, destination routing, and heartbeat configuration.
Connect to Socket.IO namespaces, emit custom events, and listen for server-pushed messages.
Write JavaScript or Python test scripts that execute automatically on each incoming message. Assert on response properties, validate schemas, and export test reports as HTML or PDF.
Capture microphone input and stream audio chunks directly to your WebSocket or Socket.IO endpoint. Perfect for testing speech-to-text services, audio processing pipelines, and real-time voice apps.
Record every send, receive, and subscribe action in a session. Replay recordings against live endpoints with diff mode to catch regressions, or test mode to validate behavior.
Replay a recorded session and see exactly what changed. Diff mode highlights mismatches between the baseline recording and the current response, making regression testing effortless.
Define variables per environment and reference them in URLs, headers, and message bodies with {{variable}} syntax.
Organize connections into workspaces and folders. Drag-and-drop to reorder. Export and import entire folders as JSON.
JSON, XML, JavaScript, and Python highlighting in message editors and test scripts, with variable overlays.
Connect a Git repository to version-control your workspace. Push and pull collections and environments via the built-in Git sync.
Import AsyncAPI specs to auto-generate connection collections with the right protocols, endpoints, and topics pre-filled.
Open multiple connections as tabs and switch between them instantly. Each tab keeps its own state, messages, and test results.
Download Bytowl for free and start debugging WebSocket, STOMP, and Socket.IO endpoints in minutes.
Windows and Linux builds coming soon.