Proxync

Tunnel your localhost to the world. Capture every request. Standalone, local-first developer studio.

         

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Proxync is a standalone, local-first desktop application that sits next to your running server. You click a button, and suddenly your localhost:3000 is available on a public URL — with every request flowing through it logged, inspectable, and replayable. It's like ngrok, Postman, and Swagger UI had a baby, running entirely on your machine.

Why this exists

We got tired of switching between five tabs to debug a single webhook. The tunnel in one window. Postman in another. Swagger open somewhere. Proxync puts all of that in one place, running completely offline with local file-based state serialization.

What you get

• One-click tunneling — Direct Cloudflare Tunnels (free public HTTPS) or Localtunnel. Pick one, click Go Live.
• Local Intercepting TCP Proxy — Runs a lightweight Rust-based interceptor locally that captures and logs request and response headers dynamically.
• Live traffic inspector — Every request and response captured in real-time. Headers, body, timing, status — the works.
• Auto-generated Swagger docs — We watch your traffic and build an OpenAPI spec from it. No YAML required.
• Built-in request runner — Basically Postman, but inside the app. Replay captured requests, tweak them, save collections.
• Observability Hub — Monitor environment health, active request volume, and workspace posture metrics.
• Interactive Documentation Hub — Integrated offline documentation for setting up tunnels, routing, and developer workflows.
• Custom domains — Map custom domains directly to your local tunnel with registrar tips and instant verification.

The stack

The application is built on Tauri v2 (Rust backend, React + TypeScript frontend). It runs entirely offline and standalone, saving state locally in your system's AppData or configuration folder (AppData/Roaming/Proxync/data.json on Windows or ~/.config/Proxync/data.json on macOS/Linux) with zero external API dependencies.

Get it running

You need Node ≥ 20 and the Rust toolchain.

# Clone the repository
git clone https://github.com/Inilax/Proxync.git
cd proxync
npm install

# Start the desktop app in development mode
cd packages/desktop
npm run tauri dev

That's it. The Tauri window opens, you see your running processes, you hit Share, and you're live.

Want to contribute?

We'd genuinely love that. Here's the gist:

1. Fork it
2. Branch off: git checkout -b feature/main-your-thing
3. Make sure it compiles: npm run build
4. Open a PR

The CHANGELOG.md tracks what's been built and what's next.

A few ground rules:

• Don't block the Tauri main thread — tokio::spawn is your friend for asynchronous background operations.
• Keep all local app state serialization non-blocking and thread-safe.
• Ensure spawned child processes (like cloudflared or localtunnel) are correctly monitored and terminated on close to prevent orphan processes.

What's next

• v0.2.0 Stabilization & UX Redesign — Fix all minor bug issues raised in v0.1.8, complete studio UI/UX redesign, and include enhanced custom domain verification in v0.2.0.
• Native High-Speed Proxync Tunneling — Launch our own proprietary Proxync Tunneling infrastructure alongside Cloudflare Tunnels — built for higher efficiency, lower latency, and maximum speed.
• CLI Companion (proxync-cli) — Run quick tunnels directly from your terminal without opening the desktop GUI when you only need tunneling.
• AI-Powered Traffic Debugger — Intelligent local agent that automatically flags slow endpoints, common header/schema mismatches, and suggests fixes.
• Enterprise Edition — Team collaboration workspaces, team sharing, live session preservation with Proxync Tunnels for high uptime, voice chat, and public custom domain visibility.
• On-The-Fly Request & Response Mocking — Intercept and tweak HTTP request/response headers and payloads on the fly before they hit your localhost.
• Offline-First SQLite State Engine — Transition local state serialization to SQLite for high-performance log querying and large payload storage.
• Native OS Webhook & Tunnel Notifications — Instant OS notifications for incoming webhooks and tunnel lifecycle events.

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