The AI-Powered Network Debugging Tool Crafted for Modern Developers
Control your network flows with intelligent interception, dynamic modification, and automation in a modern, lightweight desktop app.
RelayCraft Interface Preview
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AI Powered
Create rules with natural language, analyze requests intelligently, boosting efficiency by 10x.
Modern UI
Designed for developers with a modern interface, saying goodbye to outdated tool aesthetics.
Free & Open Source
Open sourced under GPL v3, permanently free for individual developers.
Cross Platform
Supports Windows, macOS, Linux. One tool for all platforms.
Capture Real-time, Clear at a Glance
- High-performance traffic list, supporting massive requests
- Rule hit annotation, clear debugging status
- Complete request/response details, JSON syntax highlighting
- Multiple export formats (HAR, cURL, proprietary format)
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Visual Rule Configuration, Goodbye Complex Scripts
- 6 Rule Types: Mock Response, Map Local, Map Remote, Rewrite Header, Network Simulate, Block Request
- 4 Match Modes: Contains, Exact, Regex, Wildcard
- Real-time match testing, instant verification
- Support grouping, batch import/export
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AI-Enhanced, Debugging Made Simple
- Natural language rule creation: "Block all Google Analytics requests"
- Intelligent request analysis: One-click interpretation, discover potential issues
- Context awareness: AI understands your current operation context
- Ctrl+K global summon, always ready
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Intercept, Modify, Release, Full Control
- Domain-level breakpoints, one-click interception
- Breakpoint management panel, batch or individual release
- Modify request content and continue sending
- Perfect support for security testing and exception simulation
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Built-in Composer, Rapid API Verification
- Support various HTTP methods
- Jump from capture to edit and resend
- One-click cURL import
- Instant response display
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Rules Not Enough? Scripts to the Rescue
- Powerful scripting based on mitmproxy
- Built-in code editor, write and use instantly
- Rules are a subset of scripts, seamless progression
- Access full mitmproxy API for limitless customization
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One-click Install, Zero Threshold HTTPS Capture
- Intelligent detection of certificate installation status
- One-click system certificate installation
- Detailed manual installation guide (including mobile)
- Support certificate regeneration
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Security & Privacy: Your Data, Yours Alone
Fully Offline
All core features work offline. Your traffic data never leaves your device.
No Account Required
No registration, no login, no subscription. Download and use instantly.
Local Storage
Rules, configs, and capture data are stored locally. You have full control.
Local AI Support
Supports local LLMs like Ollama. Sensitive data stays on your machine.
Open Source & Auditable
GPL v3 licensed. Code is transparent, verifiable, and backdoor-free.
Zero Telemetry
No hidden data collection, user behavior analytics, or background telemetry.
Why Choose RelayCraft?
| Feature | RelayCraft | Charles | Fiddler | Proxyman |
|---|---|---|---|---|
| Price | Free Open Source | $50 | Freemium | Subscription |
| AI Capable | Full Support | No | No | No |
| Modern UI | Excellent | Fair | Fair | Excellent |
| Cross Platform | Win/Mac/Linux | Win/Mac | Win | Mac |
| Visual Rules | Complete | Basic | Basic | Basic |
Who is using RelayCraft?
Frontend Devs
Mock APIs, Debug interfaces, Solve CORS issues
Mobile Devs
Traffic analysis, Weak network simulation, App request debugging
QA Engineers
Exception simulation, Interface verification, Issue reproduction
Security Researchers
Request tampering, Vulnerability analysis, Protocol research
Start in 3 Steps
Download & Install
Choose your platform, one-click install
Install Cert
Click 'One-click Install' to complete HTTPS config
Start Capture
Start proxy, traffic captured automatically