Network Debugger

Professional network debugging tool for macOS Network Debugger helps developers and testers quickly build TCP and UDP connections, send and inspect messages, and automate repetitive tasks. Focus on your protocol logic instead of wiring up temporary tools. Key features • TCP & UDP support (client & server) • Multiple connections with clear status indicators • Message templates for frequently used payloads • One-click send and resend • Automatic replies based on matching messages • UTF-8 and other encodings • Clean, modern interface with light & dark modes UDP workflows Use UDP when you need lightweight, connectionless messaging—ideal for device discovery, LAN broadcast/multicast, telemetry, and IoT protocols. Quickly bind to a local port, send datagrams to a target host/port, and inspect incoming packets in clear, timestamped logs. Message templates Save frequently used messages as templates and send them with a single click. Great for quickly simulating login, heartbeat, and business flows without retyping. Automated test scenarios Define auto-reply rules for specific messages to simulate real-world services. Easily build end-to-end test scenarios and long-running integrations without manual intervention. Designed for productivity A focused, distraction-free UI, keyboard-friendly operations, and clear logs help you locate problems faster and keep your network debugging workflow smooth. Privacy All data is processed locally on your Mac. No messages are uploaded to any server.