A full-featured download manager — rebuilt from the ground up
Motrix by agalwood was one of the best open-source download managers available — clean UI, aria2-powered, cross-platform. It inspired thousands of users and developers alike.
However, the original project has been largely inactive since 2023. The Electron + Vue 2 + Vuex + Element UI stack accumulated technical debt, making it increasingly difficult to maintain, extend, or package for modern platforms.
What we kept
We owe a great deal to the original Motrix and its community. The following were gratefully adopted and continue to serve as the foundation for parts of Motrix Next:
- Aria2 error code system and RPC client — the error handling conventions and JSON-RPC communication layer for the aria2 engine
- Internationalization — 25+ community-contributed locale files covering Chinese, Japanese, Korean, Arabic, French, German, and many more
- Download utilities — tracker list management, cURL command parsing, and other protocol-level helpers
What we rebuilt
Motrix Next is not a fork — it is a complete rewrite. Every other layer of the application has been redesigned and reimplemented from scratch:
| Layer | Motrix (Legacy) | Motrix Next |
| ------------ | ----------------------- | ------------------------------- |
| Runtime | Electron | Tauri 2 (Rust) |
| Frontend | Vue 2 + Vuex | Vue 3 Composition API + Pinia |
| UI Framework | Element UI | Naive UI |
| Language | JavaScript | TypeScript + Rust |
| Styling | SCSS + Element theme | Vanilla CSS + custom properties |
| Engine Mgmt | Node.js `child_process` | Tauri sidecar |
| Build System | electron-builder | Vite + Cargo |
| Bundle Size | ~80 MB | ~20 MB |
| Auto-Update | electron-updater | Tauri updater plugin |
Design & Motion
The overall UI layout stays true to Motrix's original design — the sidebar navigation, task list, and preference panels all follow the familiar structure that made Motrix intuitive from day one.
What changed is everything underneath. Every transition and micro-interaction has been carefully tuned to follow Material Design 3 motion guidelines:
- Asymmetric timing — enter animations are slightly longer than exits, giving new content time to land while dismissed content leaves quickly
- Emphasized easing curves — decelerate on enter (cubic-bezier(0.2, 0, 0, 1)), accelerate on exit (cubic-bezier(0.3, 0, 0.8, 0.15)), replacing generic ease curves throughout the codebase
- Spring-based modals — dialogs use physically-modeled spring animations for a natural, responsive feel
- Consistent motion tokens — all durations and curves are defined as CSS custom properties, ensuring a unified rhythm across 12+ components
What's Changed
Motrix Next 3.9.7 promotes the complete beta series to stable with Aria2 Next 2.5.5, runtime BitTorrent connection controls, safer file deletion, dynamic Material Design 3 theming, and substantial platform and architecture refinements.
✨ New Features
BitTorrent connection controls — Configure listen and external endpoints, apply supported changes without restarting the engine, and recover port conflicts automatically
File deletion policy — Move downloaded files to the system trash or delete them permanently
Dynamic color system — Use preset or custom seed colors with harmonized semantic roles across light and dark themes
Peer protection and diagnostics — Manage BT peer blocklists, log levels, log retention, and diagnostic exports
Task experience — Resume eligible paused tasks, show sidebar task counts, and control the task-list watermark
🛠 Improvements
Updated all six bundled engine binaries to Aria2 Next 2.5.5
Reorganized BitTorrent, DHT, peer discovery, and sharing settings by protocol ownership
Added transactional preference saves with engine and configuration rollback on failure
Made Rust the sole task-lifecycle poller and consolidated shared configuration, proxy, and task utilities
Lazy-loaded locale messages and reduced the main frontend bundle
Added a custom macOS DMG experience, macOS ad-hoc signing, and Linux desktop integration
