bolt Version 2.1.0 Production Release terminal Pure Rust Core • Tauri v2 Native

Concept App — Download Studio

The next-generation high-speed media downloader and stream interceptor. Engineered from scratch in Rust with 64-thread parallel HTTP range bisection, discrete 10–50 MiB YouTube anti-throttle slicing, watermark-free TikTok archives, multi-type captions (container embed, sidecar .srt, and plain text transcripts), and true 100% offline Ed25519 cryptographic lifetime ownership.

verified Architectural Highlights

speed
Parallel Range Bisection
Up to 64 parallel threads with pre-allocated zero-merge sparse I/O. Eliminates disk thrashing and slow post-download concatenation.
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YouTube CDN Anti-Throttle
Discrete chunk slicing (2–50 MiB) bypassing YouTube's 1.5 MB/s CDN clamp to reach 50+ MB/s full wire speed.
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3-Type Subtitle Architecture
Mux into container, save SubRip .srt with timecodes, or save pure spoken transcript .txt. Includes Khmer (&tlang=km auto-translation).
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100% Offline Flight Mode
Ed25519 hardware-bound machine receipts verified locally. You own your software for life—no DRM servers can ever lock you out.

Engineered for Unmatched Download Velocity

Download Studio is not an Electron wrapper. It is a native desktop application compiled directly to x86_64 machine code using Rust and Tauri v2, consuming less than 65 MB of RAM under full 64-thread load.

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Dynamic Segment Bisection

Segments are split in real time based on active bandwidth. Idle workers automatically steal work from slower segments, writing directly to targeted byte offsets via pre-allocated sparse disk writers without temporary file merging.

  • check_circle 1 to 64 parallel HTTP range segments
  • check_circle Zero-merge positional seek_write I/O
  • check_circle Crash-proof binary bitmap checkpoints (.dlmeta)
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8K UHD & Downward Quality Matching

Download pristine 8K, 4K, 1440p, and 1080p video streams with intelligent downward-only fallback. If your target resolution is unavailable, the engine selects the highest-bitrate stream below your ceiling rather than unexpectedly upgrading.

  • check_circle Full 8K 60fps AV1 / VP9 stream matching
  • check_circle Adaptive 3-tier FFmpeg remuxing fallback
  • check_circle Downward-only resolution preservation
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Multi-Type Captions & Transcripts

Never struggle with unreadable or missing subtitles. Choose between 3 download architectures simultaneously, with native support for Khmer and automated YouTube translation API fallback.

  • check_circle Type 1: Container embed (MP4 mov_text / MKV srt)
  • check_circle Type 2: Sidecar SubRip (.srt) with millisecond timecodes
  • check_circle Type 3: Clean Plain Text (.txt) transcript deduplicated
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TikTok HD & Audio Extraction

Archive TikTok videos in full 1080p HD without watermarks. Supports multi-image photo slideshows, author profile batch archives, and lossless high-fidelity audio extraction directly into MP3/AAC.

  • check_circle 100% clean video with zero watermarks
  • check_circle TikTok photo slideshow audio extraction
  • check_circle Full channel and creator batch downloads
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12 Global UI Localization Languages

Built for creators and power users worldwide. Seamlessly switch between 12 fully-translated UI languages, featuring Aurora Amber glassmorphism with Windows Registry light/dark theme synchronization.

  • check_circle English, Khmer, Lao, Spanish, French, German
  • check_circle Chinese, Japanese, Vietnamese, Thai, Indonesian, Russian
  • check_circle Type-safe fallback proxy ensures zero UI crash
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True Offline Lifetime Ownership

No recurring monthly subscriptions and no DRM servers phoning home to lock you out. Your Pro license key binds cryptographically to your hardware machine ID with Ed25519 signatures, verifying in under 0.05ms locally.

  • check_circle 2 authorized personal PC slots per key
  • check_circle 100% offline flight mode verification
  • check_circle Remote unbind console at license-management.khael.org

extension Browser Extension Integration Hub

Connect Google Chrome, Microsoft Edge, or Brave Browser directly to Concept App - Download Studio. Enjoy floating 1-click video download buttons, automatic download interception for large files, and 1-click session cookie authentication sync.

download Download Extension Package (.zip • 22 KB)
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Chrome Web Store Submission: Pending Review Our official Manifest V3 extension package (v2.0.0) is currently in review by the Google Chrome Web Store team. Direct 1-click web store installation will be activated right here once approved!
Manifest V3 Compliant

build Manual Installation in 30 Seconds (Chrome, Edge & Brave)

1

Download & Extract ZIP

Download Concept-App-Download-Studio-Chrome-Extension-v2.0.0.zip above and extract it into a permanent folder (e.g. C:\Users\YourName\Documents\Concept-Extension).

2

Open Extensions Manager

In your browser address bar, navigate to:
• Chrome: chrome://extensions
• Edge: edge://extensions
• Brave: brave://extensions

3

Enable Developer Mode

Turn ON the Developer mode toggle switch in the top-right corner of the Extensions page.

4

Click "Load unpacked"

Click the Load unpacked button in the top toolbar, select the unzipped extension directory, and click Select Folder.

How It Connects: The extension uses a high-performance local HTTP loopback server on http://127.0.0.1:9666. It communicates exclusively with your local desktop application on your computer. Zero browsing data, URLs, or cookies are ever uploaded to any cloud server.

Simple, Transparent Pricing

Try the Free Edition indefinitely or unlock full 8K UHD velocity and 64-thread parallel acceleration with a one-time lifetime license.

Feature / Capability Free Edition Pro Lifetime Edition ($15)
Maximum Video Quality 720p HD Standard 8K UHD / 4K / 1440p / 1080p 60fps
Parallel Range Segments 4 Concurrent Streams Up to 64 Parallel Streams
YouTube CDN Anti-Throttle Standard Advanced Dev Mode (2 to 50 MiB Slicing)
TikTok Watermark-Free Downloader Standard Unrestricted HD + Slideshow Audio
Captions & Transcripts Container Embed Only Embed + Sidecar .SRT + Plain Text .TXT
Queue Capacity 5 Concurrent Tasks Unlimited Batch & Playlist Ingestion
Automated Scheduler & Sleep Trigger Disabled Full Hourly/Daily Scheduler Included
Authorized Personal PC Devices 1 Device 2 PCs Simultaneously (Perpetual)
Updates & Support Standard Free Perpetual Lifetime Auto-Updates
Pricing $0 Free $15.00 USD (One-time Lifetime)
download Download Free Edition (.exe)