01
Dynamic Range segmentation
Reassigns byte ranges dynamically to keep every connection working.
动态重新分配字节区间，让每条连接持续工作。8 Range segmentsRebalanced live
Swifty Download ManagerDownload faster.
Resume anytime.
An Apple-native download manager with optimized HTTP Range segmentation, parallel connections, and persistent resume.
原生 Apple 平台下载工具，支持动态 HTTP Range 分段、多连接并行与可靠断点续传。
No accounts. No analytics. No developer data collection.
Downloads3 active
ZIP
DMG
✓
Built for the whole transfer
Fast by design.
Ready to resume.
Split the file intelligently, keep every connection working, and resume interrupted transfers without throwing progress away.
02
Use every connection
Fetches independent ranges in parallel to use more available bandwidth.
并行获取独立区间，尽可能利用可用带宽。Single connection1× baseline
SDM · Up to 8 connectionsToward available bandwidth
Illustrative comparison — actual speed depends on the server, network, file, and HTTP Range support.
示意对比——实际速度取决于服务器、网络、文件与 HTTP Range 支持。
03
Resume with confidence
Keeps progress on disk so interrupted downloads can continue.
将进度持久保存到磁盘，中断后可以继续下载。Checkpoint saved68%
→Resume from 68%
04
Source available
Available under FSL-1.1-MIT, transitioning to MIT after two years.
采用 FSL-1.1-MIT 许可，两年后转为 MIT。FSL-1.1-MITMIT in 2 years
macOS Lock Screen
Keep an eye on every download.
Even while your Mac is locked.
下载状态，
抬眼可见。
锁屏时也一样。
See recent downloads, live progress, transfer speed, time remaining, and task status without unlocking your Mac.
无需解锁 Mac，即可查看最近下载、实时进度、传输速度、剩余时间与任务状态。
Enable it in Settings可在设置中开启Off by default默认关闭
Choose your route
Two engines.
One clear choice.
Choose multi-connection libcurl for HTTP Range acceleration and granular resume control, or URLSession for system-native background transfers.
Power×8
libcurl
Optimized segmentation keeps Range connections working toward your available bandwidth.
- Dynamic HTTP Range segmentation
- Multiple parallel connections
- SQLite-backed resumable state
- Per-connection progress and bandwidth control
Native☁
URLSession
For system-native background transfers.
- Native background downloads
- System-managed resume
- Apple system trust
- Energy-aware networking
Safari + Chrome
One click.
SDM takes it from here.
On macOS, extensions for Safari and Chrome recognize download links, eligible click-triggered downloads, and the Download with SDM context-menu action.
Ready when you are
Give every download
a better landing.
Free to download · Source available · FSL-1.1-MIT · macOS 14+