AI-Native
Web Traffic Debugging Tool
A professional-grade, AI-native network debugging tool built with Tauri, React, and Rust. Features a powerful proxy engine based on mitmproxy, with deep AI integration and a built-in MCP server for external AI agents.
Built-in MCP Support
Bridge the gap between your network traffic and AI agents. RelayCraft features a built-in Model Context Protocol server.
Live Traffic Context
Let Claude or Cursor "read" your live sessions, search flows, and understand API behaviors instantly.
Agent-Driven Debugging
Empower your AI to create rules, replay requests, and manage traffic behavior using natural language.
Powerful Features for
Modern Development
Intercept, map, analyze, modify — a unified hub for all your network requests.
Traffic Monitor
High-performance real-time traffic capture powered by mitmproxy. Supports massive request lists with full detail inspection, image previews, and syntax highlighting.
Rules Engine
A revolutionary visual rule builder that manages traffic behavior without config files. Supports 6 powerful rule types for total control.
AI Assistant
AI-native throughout the entire workflow. Global Ctrl(⌘) + K command center understands your intent and acts as your co-debugger.
Breakpoints
Real-time pause, edit, and resume requests/responses. Supports path matching or regex matching, request or response interception — perfect for security testing and edge case simulation.
Request Composer
Built-in API client designed for debugging. Edit and resend directly from request list or import cURL with one click, view request response instantly.
Python Scripting
Natively supports the full mitmproxy Python ecosystem. Write powerful custom logics for complex scenarios beyond visual rules.
Extensibility
Advanced architecture design supporting plugins and themes. Extend software capabilities through flexible plugin system, customize interface styles with rich themes — build your exclusive tool.
Security & Privacy: Your data, only yours
Fully Offline
No internet required. Your traffic data never leaves your device.
Zero Accounts
No registration, no login, no subscriptions. Just download and use.
Local Storage
All rules, configs, and captures 100% stored locally, fully under your control.
Local AI Support
Support for Ollama and other local LLMs — sensitive data never goes to cloud.
Open Source
Core code AGPLv3 open source, security verified by community, no backdoors.
No Telemetry
Reject all forms of invisible data collection, analysis, or tracking.
Who is using RelayCraft?
Web Frontend Devs
Mock APIs, debug network requests, and solve CORS instantly with visual rules.
Mobile Developers
Capture traffic from any device, simulate weak networks, and debug API calls.
QA Engineers
Easily simulate edge cases, verify interfaces, and reproduce complex issues.
Security Researchers
Request tampering, vulnerability analysis, and in-depth protocol research.
Start Debugging in Minutes
Download RelayCraft for your preferred operating system. Free for personal use.
For complete assets and release notes, visit the GitHub Releases page. You can verify file integrity with SHA256 checksums.