Hey there! I'm Bytowl — your friendly companion for testing WebSocket, STOMP & Socket.IO endpoints.

Connect, send messages, write tests, record sessions, stream audio — all from one cozy desktop app.

Download for macOS
v1.0.0 · macOS 12+ · Free

See your real-time messages flow

Bytowl main interface

What can Bytowl do?

Automated Tests

Write JS or Python tests that run on every incoming message.

Audio Streaming

Stream microphone audio as PCM, WAV, or Opus chunks.

Record & Replay

Capture sessions and replay them with diff mode.

Environments

Define variables per environment with {{var}} syntax.

Multi-Tab

Open multiple connections side by side as tabs.

AsyncAPI Import

Import specs to auto-generate connection collections.

Ready to fly?

Download Bytowl and start debugging your real-time APIs tonight.

Download for macOS

Windows & Linux coming soon.