FluxDown

Downloads, Supercharged.

A blazing fast, multi-protocol download manager — the free & open-source IDM alternative.

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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
• 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 forever, no ads, no tracking, no account, local-first

Features

FluxDown vs. IDM

Installation

Grab the latest build from GitHub Releases or fluxdown.zerx.dev:

Browser Extension

Install the extension so FluxDown takes over browser downloads automatically:

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")]

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

# 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

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.