FluxDown FluxDown
Use this command to install FluxDown:
winget install --id=zerx-lab.FluxDown -e Rust 驱动的多协议下载管理器，支持 HTTP/FTP/BitTorrent 磁力链接及 HLS/DASH 流媒体，智能多线程加速与浏览器无缝集成。精美界面，极致性能，永久免费，零广告。
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README
FluxDown
Downloads, Supercharged.
A blazing fast, multi-protocol download manager — the free & open-source IDM alternative.
Website · Download · Changelog · FAQ · Feedback
English | 简体中文
Highlights
- Up to 10x faster — Rust + Tokio engine with IDM-style dynamic segmentation
- Multi-protocol — HTTP/HTTPS, FTP, BitTorrent, eD2K, HLS & DASH streaming
- Browser integration — Chrome / Edge / Firefox extension with a 3-layer interception engine
- AI-agent ready — built-in MCP (Model Context Protocol) server: let Claude, Cursor & other AI clients manage your downloads
- Resume anywhere — full download state persisted in SQLite; survive crashes and reboots
- Beautiful UI — light/dark themes, 13 color schemes, responsive three-pane layout
- Clean & private — free and open source, no ads, no tracking, no account required, local-first
Features
| Feature | Description |
|---|---|
| Rust-Powered Engine | Built on Rust and Tokio with zero-cost abstractions — memory-safe concurrency at maximum throughput |
| Smart Segmentation | Segments split dynamically at runtime; idle threads rescue slow segments, just like IDM — but smarter |
| Multi-Protocol | Dedicated engines for HTTP/HTTPS, FTP, BitTorrent (DHT/UPnP/magnet), eD2K (server + Kad DHT source finding, MD4 verification), HLS (AES-decrypt) and DASH |
| Speed Control | Token-bucket global rate limiting — download in the background without killing your browsing |
| Resume Anywhere | Every byte tracked in SQLite with WAL; power loss never costs you progress |
| Browser Integration | Three-layer download interception, streaming media sniffing, Alt+Click bypass, right-click send |
| MCP Server | Built-in Model Context Protocol endpoint (Streamable HTTP) with 9 tools — AI agents can add, monitor and control downloads |
| Beautiful Interface | shadcn-style widgets, IDM-style segment visualization, named queues, system tray |
| Clean & Private | Zero ads, zero telemetry lock-in, zero accounts — your data never leaves your machine |
FluxDown vs. IDM
| FluxDown | IDM | |
|---|---|---|
| Price | Free & open source | $24.95 + renewals |
| Open source | Yes (AGPL-3.0) | No |
| Platforms | Windows / macOS / Linux / NAS / Android | Windows only |
| BitTorrent & magnet | Yes | No |
| eD2K / eMule links | Yes | No |
| HLS / DASH streaming | Yes | Partial |
| Dynamic segmentation | Yes | Yes |
| Browser extension | Chrome / Edge / Firefox | Yes |
| Ads & tracking | None | — |
Installation
Grab the latest build from GitHub Releases or fluxdown.zerx.dev:
| Platform | Packages |
|---|---|
| Windows (x64 / ARM64) | setup.exe installer · portable .zip |
| macOS (Intel / Apple Silicon) | .dmg · portable .tar.gz |
| Linux (x64) | .AppImage · .deb · Arch .pkg.tar.zst · portable .tar.gz |
| Android (arm64-v8a / armeabi-v7a / x86_64) | per-ABI .apk · universal .apk |
| NAS / Server (headless, x64 / ARM64) | Docker · Synology DSM 6/7 .spk · QNAP .qpkg · OpenWrt .ipk · Unraid CA template · CasaOS / ZimaOS app store |
Browser Extension
Install the extension so FluxDown takes over browser downloads automatically:
MCP Server (Model Context Protocol)
FluxDown ships a built-in MCP server so AI agents (Claude Desktop, Cursor, Cline, …) can manage downloads via the Model Context Protocol. It speaks Streamable HTTP (JSON-RPC 2.0 over a single POST /mcp) on the local API port — no extra process needed.
- Endpoint:
http://127.0.0.1:17800/mcp(local-only by default) - Auth: Bearer token (
Authorization: BearerorX-FluxDown-Token), shared with the management API - Enable: Settings → API Service → toggle MCP endpoint (a token is generated automatically); the headless server enables it by default
Tools (9)
| Tool | Description |
|---|---|
download_add | Create a download task (HTTP/HTTPS, FTP, magnet, BitTorrent) |
download_list | List tasks with progress/speed/status, optional status filter |
download_get | Get a single task by ID |
download_pause / download_resume | Pause / resume one task |
download_pause_all / download_resume_all | Pause / resume all tasks |
download_remove | Remove a task, optionally deleting downloaded files |
queue_list | List named queues and their configuration |
Client configuration
{
"mcpServers": {
"fluxdown": {
"url": "http://127.0.0.1:17800/mcp",
"headers": { "Authorization": "Bearer " }
}
}
}
The MCP layer is implemented in native/api/src/mcp.rs on top of the same ApiHost trait that powers the REST management API and aria2-compatible JSON-RPC.
Architecture
Flutter renders the UI; a zero-FFI Rust engine does the heavy lifting. The two talk through Rinf signals, and the browser extension connects via Native Messaging.
flowchart TD
EXT["Browser Extension (WXT)"] -->|Native Messaging| NMH["fluxdown_nmh"]
NMH -->|Named Pipe / Unix socket| HUB
UI["Flutter UI (shadcn_ui)"] <-->|Rinf signals| HUB["hub — FFI adapter"]
HUB --> ENGINE["fluxdown_engine"]
ENGINE --> HTTP["HTTP/HTTPS"]
ENGINE --> FTP["FTP"]
ENGINE --> BT["BitTorrent"]
ENGINE --> ED2K["eD2K"]
ENGINE --> HLS["HLS / DASH"]
ENGINE --> DB[("SQLite")]
| Layer | Tech | Path |
|---|---|---|
| UI | Flutter + shadcn_ui | lib/ |
| FFI bridge | Rinf (Dart ↔ Rust signals) | native/hub/ |
| Download engine | Rust + Tokio (zero FFI deps) | native/engine/ |
| Browser extension | WXT + TypeScript | fluxDown/ |
| Website | Astro + React | website/ |
Building from Source
Prerequisites: Flutter SDK · Rust toolchain · Rinf CLI
# Check your environment
rustc --version
flutter doctor
# Install the Rinf CLI (once)
cargo install rinf_cli
# Fetch dependencies & generate Dart bindings
flutter pub get
rinf gen
# Run in debug mode
flutter run
# Build a release
flutter build windows --release # or: macos / linux
Linux system dependencies
# Debian/Ubuntu
sudo apt-get install cmake ninja-build clang pkg-config \
libgtk-3-dev libayatana-appindicator3-dev libnotify-dev libsecret-1-dev patchelf zstd
# Arch Linux
sudo pacman -S cmake ninja clang pkgconf gtk3 libayatana-appindicator libnotify libsecret patchelf zstd
The NMH relay binary (fluxdown_nmh) is built automatically by CMake during flutter build. Distribution packages (AppImage / deb / Arch / portable) are produced by CI on every tag.
Running tests
flutter test # Dart tests
cargo test -p fluxdown_engine # Rust engine tests
cargo test -p hub # FFI adapter tests
Contributing & Community
- Bug reports / feature requests — GitHub Issues or the in-app feedback dialog
- QQ Group — 832143651
Pull requests are welcome! Before submitting, please make sure:
cargo fmt --check && cargo clippy -- -D warnings # Rust
flutter analyze # Dart
License
Distributed under the GNU Affero General Public License v3.0.
If FluxDown saves you time, consider giving it a Star — it helps more people discover the project.
Made by zerx-lab