Network Speed Combiner

Network Speed Combiner is a high-performance download manager for Windows, macOS, and Linux that downloads files over multiple internet connections concurrently. If your computer has Wi-Fi and a mobile phone tethered via USB (or Ethernet), Network Speed Combiner utilizes both connections simultaneously for the same download. It supports direct HTTP/HTTPS links, magnet links, and .torrent files, complete with queues, detailed chunk telemetry, and per-interface speed and data allowance controls.

Features

• Combine Multiple Networks: Aggregates throughput from multiple network adapters (e.g. Wi-Fi + USB 4G/5G Tethering + Ethernet) without requiring VPNs, virtual NICs, or admin rights.
• Dynamic Chunk Scheduling: Files are split into dynamic blocks (up to 8 MB) distributed across streams. Faster networks automatically pick up more chunks.
• Endgame Racing: Prevents slow finishes by racing the last remaining chunks across idle connections.
• Pause & Resume: Safe partial resuming with ETag and Last-Modified integrity validation.
• BitTorrent Multi-Homing: WebTorrent integration pinning peers and trackers across available interfaces.
• Interface Bandwidth & Data Limits: Set total or per-network bandwidth caps and daily/weekly/monthly quotas.
• Slow Mode & Overnight Scheduling: One-click bandwidth throttle and time-window scheduling.

How It Works

Operating systems typically route all network traffic through a single default gateway. Network Speed Combiner binds individual sockets to the local address of each active network adapter, pulling distinct ranges via HTTP Range: bytes=... requests concurrently.

                    ┌── Wi-Fi (192.168.1.40) ──────┐
                    │                              │
File ──→ Split ─────┼── Ethernet (10.0.0.12) ──────┼──→ Assembled file
                    │                              │
                    └── USB tether (172.20.10.3) ──┘

Getting Started

Prerequisites

• Node.js 22+
• npm 9+

Setup & Development

# Clone the repository
git clone https://github.com/VG31OP/network-speed-combiner.git
cd network-speed-combiner

# Install dependencies
npm install

# Start in development mode
npm run dev

Building for Production

• Windows Unpacked:

  npm run build:unpack

• Windows Installer:

  npm run build:win

• macOS:

  npm run build:mac

• Linux:

  npm run build:linux

Tech Stack

• Framework: Electron
• Frontend: React 19, TypeScript, Tailwind CSS v4, Base UI, Zustand, Lucide Icons
• Bundler: electron-vite
• Networking: Node.js net, http, https, koffi, WebTorrent

License

MIT License. See LICENSE for details.