SnapDoc is a high-performance desktop application designed for screenshot capture, video recording, and quick annotation, operating under the philosophy of "Speed-first" – optimizing speed to the maximum from shortcut key operations, capturing/recording, editing to saving or copying to clipboard.

2. Problems Solved

• Poor default tools: The built-in tools of operating systems (Snipping Tool on Windows or default shortcuts of macOS) lack advanced editing tools such as automatic step numbering, long page scrolling capture, or blurring sensitive information.
• Bulky third-party applications that consume resources or are platform-exclusive: Many existing solutions are either built on Electron, using hundreds of MB of RAM when running in the background, or are exclusively available on macOS (like CleanShot X), preventing cross-platform users from having a consistent experience.
• Complex video recording and trimming process: Typically, when recording the screen for tutorials or bug reports, users often need to open heavyweight editing software (Premiere, CapCut) just to trim excess footage. SnapDoc comes with an instant video trimming tool right after recording finishes.

• Data loss after screenshotting: Users frequently take screenshots to send quickly via messages and then forget to save them, leaving no trace when they need to find them later. SnapDoc automatically stores and centrally manages the entire history of images/videos completely locally on the machine.
  
  3. Key Features

  • Multi-mode screenshot & Scrolling Capture: Supports 6 flexible capture modes including Full Screen Capture, Custom Area Capture, Smart Window Capture (auto-detects borders), All Screens Capture, Scrolling Capture, and Quick Draw Capture.
  • In-depth image annotation toolkit (Konva Canvas Editor): Fully integrates visual tools for creating guidance documents: Automatic step numbering (Step counter / Numbered arrow), drawing arrows, shapes, inserting text, highlighting, along with data security tools such as Blurring (Blur), Pixelating, and coloring sensitive areas.
  • Synchronized multi-source screen recording: Smooth recording at 30fps in region, window, or full screen; allows flexible audio capture from Microphone, System Audio, or a combination of both sources with real-time synchronization.
  • Instant Video Trimming (CapCut style): A Review window opens immediately after stopping recording, allowing users to preview each frame (filmstrip) and execute quick actions using shortcuts: split segment (Ctrl/Cmd+B), trim start/end (Q/W), delete excess segments and export files immediately without complex rendering.
  • Local History & Library Management: Automatically logs every capture/recording into an SQLite database on the machine; supports filtering by format, capture mode, time, along with a safe Trash mechanism to prevent accidental deletions.
  • Necessary access permissions: The application requires Screen Recording permission from the operating system (via Apple ScreenCaptureKit on macOS and Windows Graphics Capture API on Windows) to extract images from windows/screens, along with Microphone permission when users engage the voice recording feature.

4. Who Should Use It?

• Software engineers & QA/Testers: Those who frequently need to take screenshots to illustrate bugs, record workflow videos, obscure sensitive tokens/passwords, and quickly copy them into Jira, GitHub Issues, or Slack.
• Technical writers & Product Managers: Need to create user guides (User Guide / SOP), handover documents with visually numbered steps 1-2-3 and screenshots of long interface scrolling.
• Online educators, Speakers & Content Creators: Need to record lectures, demonstrate computer tricks, capture both microphone audio and software sounds, and quickly trim segments of stumbled speech before saving.
• IT Helpdesk & Customer Support: Need to address users' questions with highlighted images, clear pointing arrows, minimizing the need for lengthy text explanations.

5. How to Get Started

• Supported Platforms: macOS (compatible with both Apple Silicon &