Multi-Threaded • BitTorrent • Material 3

Fast. Smart. Reliable.
Downloads.

High-Speed Multi-Threaded HTTP/HTTPS & Full-Featured BitTorrent Client for Android

SDM (SoftTech Download Manager) is designed to give you total control over your bandwidth, battery, and file storage. Whether you're downloading massive media files or joining peer swarms, SDM delivers maximum throughput with a modern Material 3 Cyber Midnight user experience.

High Speed Downloads

Pause & Smart Resume

Browser & Magnet Links

Safe, Private & Secure

Explore Features Privacy Policy BitTorrent Engine

16x Parallel Streams

100% On-Device & Zero Tracking

Powerful Engine

Everything You Need In A Pro Download Manager

Engineered from the ground up for maximum throughput, resilience, and battery efficiency.

⚡ High-Speed Multi-Threaded Downloads

Harness the full capacity of your high-speed Wi-Fi or 5G connection with segmented multi-part acceleration.

Parallel Connections: Splits large HTTP/HTTPS files into multiple byte-range segments to saturate bandwidth.
Smart Resume & Recovery: Effortlessly resume interrupted downloads without starting over from 0%.
Automatic Error Handling: Seamlessly auto-reconnects during intermittent Wi-Fi or cellular dropouts.

🌐 Full-Featured BitTorrent Client

A native C++ libtorrent engine running right on your device for lightning-fast peer-to-peer swarms.

libtorrent4j Powered: Industry-standard high-performance BitTorrent session core.
Magnet URIs & .torrent: Instant one-tap import from browsers, clipboards, and files.
DHT, PeX & LSD: Discover swarms and peers even without central tracker servers.
Sequential Download: Stream media files progressively while the download finishes.

🎨 Modern Cyber Midnight Design

Designed around Google's Material Design 3 guidelines with a dark cyber aesthetic tailored for OLED screens.

Material Design 3: Rounded sheets, fluid layout transitions, and high contrast palettes.
Micro-Interactions: Spring physics, haptic feedback on actions, and live visualizers.
Adaptive Layouts: Optimized for standard phones, foldables, and large two-pane tablets.

🔋 Battery, Scheduling & Traffic Controls

Keep your data bill under control and protect your battery life with intelligent automation rules.

Flexible Scheduler: Set exact start and pause time windows for off-peak downloads.
Power Rules: Restrict heavy queues to charger-only or auto-pause on low battery.
Network Guard: Restrict downloads to unmetered Wi-Fi to eliminate mobile data charges.
Bandwidth Caps: Set independent download and upload speed limits.

📁 Smart Storage & File Management

Modern Android Storage Access Framework (SAF) integration with anti-fragmentation pre-allocation.

SAF Compatibility: Store files directly on internal storage or external SD cards safely.
Disk Pre-Allocation: Pre-allocates full file size upfront to avoid filesystem fragmentation and mid-download out-of-space crashes.
Tag Organization: Organize and filter downloads using custom color-coded tags.

🔒 Privacy & Open Source

Your downloads are your business. Zero telemetry, zero accounts, and 100% on-device execution.

100% On-Device: No account required, zero tracking, and zero analytical telemetry sent to external servers.
GPLv3+ Licensed: Free and open-source software ensuring complete transparency and user rights.
Zero In-App Ads: Clean, unobtrusive experience focused on pure performance.

BitTorrent Core

Industrial-Grade P2P Engine Powered by libtorrent

SDM incorporates libtorrent4j (JNI bindings to Arvid Norberg's renowned C++ libtorrent library). Experience unmatched peer discovery, robust NAT penetration, and seamless swarm orchestration.

Decentralized Swarms

Full DHT (Kademlia), PeX (Peer Exchange), and LSD (Local Service Discovery) to connect without trackers.

Protocol Encryption

Supports forced or enabled stream encryption, uTP transport protocol, and UPnP/NAT-PMP port forwarding.

Selective Priority

Pick individual files within a multi-file torrent and assign High, Normal, or Ignore/Skip priorities.

Sequential Streaming

Download pieces in sequential order from beginning to end for progressive media streaming while downloading.

BITTORRENT PEER SWARM METRICS
4.2 MB/s
 Connected to 48 Peers (12 Seeds)
 2.4 GB Down
 640 MB Up

                                
                            
                                 Encryption: Forced
                                 uTP & NAT-PMP: Active
                            

Interactive Preview

Clean Dashboard, Total Command

SDM's Cyber Midnight UI puts real-time throughput metrics, queue status, and quick clipboard actions right at your fingertips.

Smart Clipboard Interception

SDM automatically detects copied HTTP, HTTPS, and magnet URIs and presents a non-intrusive bottom sheet to add downloads in one tap.

Granular Bandwidth Throttles

Set independent speed limits for cellular vs Wi-Fi, background downloads, or high-priority foreground transfers.

Exact Alarm Scheduling

Leverages Android's exact alarm scheduling and boot-completed receivers to accurately fire tasks during unmetered midnight windows.

DOWNLOAD SPEED

1.8 MB/s

Current Speed

125.4 MB

8.7 MB

2 Active

15 Done

1 Paused

0 Sched

Vacation_Video_4K.mp4

Downloading 125.4 MB / 1.2 GB

41% 1.8 MB/s ETA: 2m 15s

Technical_Document.pdf

Paused 32.6 MB / 114 MB

Full Transparency

Required Permissions Explained

SDM only requests permissions strictly required to execute downloads and manage storage safely.

Foreground Service & Notifications

Background Downloads & Progress

Allows SDM to keep multi-part downloads active when the screen turns off or when you switch apps. Real-time progress bars and pause/resume buttons are displayed in your notification tray.

Exact Alarm & Boot Receiver

Precise Session Scheduling

Enables the scheduler to wake up tasks precisely at user-configured start/stop times (e.g., free midnight Wi-Fi windows) and restore pending scheduled sessions after a device reboot.

Storage Access Framework (SAF)

Direct Safe File Placement

Modern Android SAF permission allows you to choose exact destination folders on internal storage or external MicroSD cards without giving unrestricted storage access to your device.

Engineering

Architected with Modern Android Standards

Clean, robust, memory-efficient native Android architecture.

100% Kotlin

Modern coroutines & StateFlow reactive pipelines

libtorrent4j

High-performance C++ BitTorrent core via JNI

Room Database

Fast SQLite persistent state & queue storage

Material Design 3

Cyber Midnight dark theme & fluid animations

Storage Access (SAF)

Scoped storage for internal & external SD cards

WorkManager

Reliable background constraint execution

Minimum Android

Android 8.0 (API 26)

Target Android

Android 15 (API 35+)

Architectures

ARM64-v8a / x86_64

License

GNU GPLv3+ Open Source

Help & FAQ

Frequently Asked Questions

Common questions about SDM capabilities and settings.

How does multi-threading speed up downloads?

SDM sends multiple simultaneous HTTP byte-range requests for different parts of the same file. This overcomes single-connection throttling from web servers and ISPs, maximizing your available bandwidth.

Can I download torrents without a tracker server?

Yes! With full support for DHT (Distributed Hash Table) and Peer Exchange (PeX), SDM can find swarm peers and download complete files without relying on a central tracker.

How does sequential piece downloading work?

Normally, BitTorrent downloads pieces in random order. Enabling sequential downloading forces SDM to prioritize pieces from the beginning of the file, allowing you to stream videos or audio while they finish.

What is Disk Pre-Allocation?

When a download starts, SDM pre-allocates the total required file space on your storage upfront. This prevents disk fragmentation on large files and prevents unexpected "Disk Full" errors midway through large downloads.

Does SDM track my downloaded files or URLs?

Never. SDM operates 100% on your device. There are zero analytical tracking SDKs, no external telemetry servers, and no user accounts. Your download links and history never leave your phone.

Is SDM really open source?

Yes, SDM is released under the GNU General Public License v3.0 or later (GPLv3+), guaranteeing freedom of use, study, and improvement.

Fast. Smart. Reliable. Downloads.