No servers - 100% Local - Ultra fast - Zero configuration
| Network Devices | File Transfers |
|---|---|
 |
 |
- Automatic Firewall Configuration: No more manual scripts - SyncBeam configures Windows Firewall automatically
- UPnP Port Mapping: Automatically opens ports on your router for external connections
- NAT Detection: Detects NAT type using STUN servers for better connectivity
- Network Diagnostics: Built-in diagnostic tools to troubleshoot connection issues
- Hole Punching: Improved NAT traversal for connecting peers behind different NATs
- Better Error Messages: Detailed diagnostics when connections fail
- Zero Configuration: Devices auto-discover and connect automatically
- Network Scanner: See all devices on your network
- E2E Encryption: Military-grade security with Noise Protocol
| Feature | Description |
|---|---|
| Auto-discovery | Automatically finds and connects to SyncBeam devices on your network |
| Network Scanner | See all devices on your LAN with device-type detection |
| E2E Encryption | Noise Protocol XX + AES-256-GCM for maximum security |
| File Transfer | Support for files >10GB with automatic resume |
| Clipboard Sync | Text, images, RTF and HTML synced in real-time |
| Drag & Drop | Drag files to the outbox to send them automatically |
| Modern UI | Dark glassmorphism interface with WebView2 |
| No cloud | Zero servers, zero tracking, 100% peer-to-peer |
- Windows 10/11
- .NET 8.0 SDK
- WebView2 Runtime (included in Windows 10/11)
# Clone the repository
git clone https://github.com/Nicoo01x/SyncBeam.git
cd SyncBeam
# Restore dependencies
dotnet restore
# Build
dotnet build
# Run
dotnet run --project SyncBeam.App- Run SyncBeam on two or more PCs on the same network
- Devices auto-discover and connect automatically
- Scan Network to see all devices on your LAN
- Transfer by dragging files or copying to clipboard
No configuration needed! SyncBeam uses zero-config networking.
+------------------------------------------------------------------+
| SyncBeam.App |
| (WPF + WebView2 UI) |
+------------------------------------------------------------------+
| SyncBeam.Streams | SyncBeam.Clipboard | SyncBeam.UI |
| (File Transfer) | (Clipboard Sync) | (HTML/CSS/JS) |
+------------------------------------------------------------------+
| SyncBeam.P2P |
| +-------------+-------------+-------------+------------------+ |
| | Discovery | Handshake | Transport | NatTraversal | |
| | (mDNS) | (Noise XX) | (TCP+AES) | (STUN) | |
| +-------------+-------------+-------------+------------------+ |
+------------------------------------------------------------------+
SyncBeam/
├── SyncBeam.App/ # Main WPF application
│ ├── MainWindow.xaml # Window with WebView2
│ └── WebViewHost.cs # JS <-> C# bridge
│
├── SyncBeam.P2P/ # P2P networking library
│ ├── Core/ # Cryptography (Ed25519, AES-GCM)
│ ├── Discovery/ # mDNS for discovery
│ ├── Handshake/ # Noise Protocol XX
│ ├── Transport/ # Secure TCP transport
│ ├── NatTraversal/ # STUN + hole punching
│ ├── Network/ # Firewall, UPnP, Diagnostics
│ └── PeerManager.cs # Peer management
│
├── SyncBeam.Streams/ # Transfer engine
│ ├── FileTransferEngine.cs # Chunked streaming + resume
│ └── OutboxWatcher.cs # Auto-beam from outbox
│
├── SyncBeam.Clipboard/ # Clipboard synchronization
│ └── ClipboardWatcher.cs # Monitor + sync
│
├── SyncBeam.UI/ # Web interface
│ ├── index.html
│ ├── styles.css # Glassmorphism UI
│ └── app.js
│
└── SyncBeam.Console/ # CLI test app
└── Program.cs
SyncBeam implements military-grade security:
| Layer | Technology | Purpose |
|---|---|---|
| Identity | Ed25519 | Unique signing keys per device |
| Handshake | Noise Protocol XX | Mutual authentication with identity hiding |
| Transport | AES-256-GCM | Authenticated encryption of all data |
| Integrity | SHA-256 | Verification of each transferred chunk |
| Network | LAN Only | Connections restricted to local network |
Initiator Responder
| |
|---- e ---------------------------------------->| 1. Send ephemeral key
| |
|<--- e, ee, s, es ----------------------------| 2. DH exchange + encrypted static key
| |
|---- s, se ---------------------------------->| 3. Static key + verification
| |
|<--- OK -------------------------------------| 4. Secure channel established
| |
| Directory | Purpose |
|---|---|
~/SyncBeam/inbox |
Received files are saved here |
~/SyncBeam/outbox |
Drag files here to send them automatically |
# Debug
dotnet build
# Release
dotnet build -c Release
# Publish standalone executable
dotnet publish -c Release -r win-x64 --self-contained# P2P test console (first terminal)
dotnet run --project SyncBeam.Console
# In another terminal
dotnet run --project SyncBeam.ConsoleBoth instances will auto-discover and connect on the same network.
| Command | Description |
|---|---|
list |
List discovered peers |
connect |
Connect to a peer |
peers |
Show connected peers |
send |
Send test message |
ping |
Ping all peers |
refresh |
Refresh discovery |
quit |
Exit |
Contributions are welcome! Please read CONTRIBUTING.md for details.
This project is licensed under the MIT License - see LICENSE for details.