The Local-First Developer Studio for API Integration.
Instant public tunnels, live traffic interception, OpenAPI generation, and request workbench in one private, native desktop app. Built with Rust for zero cloud lock-in.
Version v0.2.1 · Windows x64 setup · Linux & macOS coming soon
Network Hub
Proxync is currently monitoring 1 active tunnel across us-east-1 relay nodes.
Trusted by engineering teams building with
Stop context-switching between terminal tabs and fragile cloud tools.
// Performance > Convenience
Unified Developer Workspace
Proxync replaces ngrok, Postman, Wireshark, and terminal tabs with a single, high-performance local-first studio.
Dynamic Netstat Discovery
Scans all listening services across IPv4 and IPv6 on any port. Single bulk WMI recon identifies frameworks with zero port hardcoding.
Resilient Standby Tunnels
Server restarts (`Ctrl+C` or hot reload) won't kill your public URL. Proxync holds webhook URLs in standby with branded 502 fallbacks and instant auto-recovery.
Pro Debugger & Dual-Stream Logs
Native Rust disk logging with structured AI diagnostic directives, automatic PII token redaction, and 1-click support bundle export.
Request Workbench & 1-Click IDE Jumping
Stage multi-tab HTTP drafts, benchmark latency in milliseconds, diff live replay payloads against captured production traffic, and jump directly to the controller source code in VS Code or Cursor at the exact line number.
Modular Rust Engine & Native SSH Tunnels
Built with Tauri v2 and decoupled domain modules. Direct origin port 2222 routing, Ed25519 JIT TLS certs, and 90% less RAM than Electron.
A suite of tools that feel native because they are.
Tunnels, traffic, requests, and docs — engineered as one continuous workflow.
Native High-Speed Proxync Tunneling (Ed25519 JIT certificates & WebSocket/SSH relay)
Resilient Standby Mode: Preserves webhook URLs across Ctrl+C with automatic 502 fallback & auto-recovery
4 Tunnel Providers: Proxync Native, Cloudflare Quick Tunnels, Localtunnel, and Local Loopback (*.localtest.me)
Up and running in under a minute.
No cloud account. No config wizard. No ceremony.
Install the engine
A 12MB native binary. Download once, run everywhere. No sign-up, no telemetry, no cloud.
Point it at localhost
Proxync dynamically scans all listening dev ports via netstat & WMI recon. One click launches high-speed tunnels.
Watch the stream & replay
Live traffic flows into an inspector you can filter, replay in Workbench with visual diffs, and jump straight to code.
Built for the way teams actually ship.
From indie devs to platform teams — Proxync fits into existing workflows.
I replaced ngrok, Postman, and Wireshark in a single afternoon. My laptop fan finally stopped screaming.
The auto-generated OpenAPI spec alone is worth the download. Docs now write themselves while I code.
Finally, a tunneling tool that doesn't ship my traffic to a third-party server. Security team approved it day one.
We replay production traffic against staging every release now. It caught three regressions last sprint.
Questions, answered.
Everything you need to know about running Proxync locally.
Yes. Workspaces, saved request collections, traffic history, and custom settings are serialized locally in a JSON store (%APPDATA%\Proxync\data.json on Windows, ~/.config/Proxync on Linux/macOS). There is no cloud account or forced cloud sign-up required.
Proxync v0.2.1 introduces native Rust disk logging (%APPDATA%/Proxync/logs) with independent dual streams: Application Diagnostics (app.log, enabled by default) and Traffic Stream (traffic.log, on-demand). It features structured AI diagnostic directives, automatic PII/credential redaction, and a 1-click Support Diagnostic Bundle Exporter (proxync-support-bundle.json).
Rather than checking a static list of ports, Proxync v0.2.1 executes a single dynamic netstat -ano scan across all IPv4 and IPv6 ports combined with a single bulk WMI/CIM process query. It automatically identifies dev frameworks (Next.js, Vite, FastAPI, NestJS, Go, Spring Boot, Django, Bun) while filtering OS daemons.
Proxync Native Tunnels connect over port 2222 with high-speed hardware-accelerated ciphers (chacha20-poly1305, aes128-gcm) and JIT Ed25519 certificate signing. Temporary keys are securely destroyed on close via Rust TempDirGuard, and secure random subdomains (e.g. px-a1b2c3d4.proxync.dev) are auto-generated.
An unconditional pre-flight security scan runs on startup to detect critical CVE release tags ([SECURITY-CVE], [TYPE: CVE-PATCH]). It automatically alerts you and streams the update with live progress tracking, ensuring zero-day vulnerabilities are patched immediately.
Workbench allows you to stage multi-tab HTTP requests, send live replays against local endpoints with millisecond duration tracking, and view side-by-side visual diffs between original captured traffic and new responses. A native Tauri IPC command also allows 1-click jumping straight to the exact endpoint controller file and line number inside VS Code or Cursor (e.g. src/routes/users.ts:42).
Unlike conventional tunnels that crash whenever you restart your local server (Ctrl+C), Proxync holds your public URL (e.g. px-xxxx.proxync.dev) in Standby. External webhooks from Stripe, GitHub, or Shopify receive a clean branded 502 Standby response while a 1000ms background health probe automatically restores full traffic the moment your local dev server boots back up.
Pressing Ctrl+K (or Cmd+K) brings up a global floating command palette allowing you to search across all active and saved workspaces, inspect active server processes, open ports, and switch workspaces in 1 click with automatic background tunnel lifecycle cleanup.
A native Windows x64 installer (Proxync_0.2.1_x64-setup.exe) ships today via Tauri v2 with built-in version-aware auto-updates and High-DPI setup wizards. Linux (.deb, .AppImage) and macOS (.dmg) support is planned for the upcoming release.
Stop context-switching.
Start syncing.
Join thousands of developers who reclaimed their local environment with Proxync. Download the engine today.
Version v0.2.1 (Windows x64 setup) · Linux & macOS coming soon