QtScrcpy is a cross-platform desktop application for mirroring and controlling Android devices over USB or Wi-Fi, implemented as a C++/Qt reimplementation of scrcpy. The codebase is a conventional Qt Widgets monolith: main.cpp initializes the application and main dialog, the UI drives ADB through QProcess to deploy and run a server component on the device, incoming video is decoded with FFmpeg and rendered with OpenGL or Metal on Apple Silicon, and keyboard/mouse/touch events are forwarded back through the scrcpy control protocol. It also provides custom JSON key mappings, group control for broadcasting input to multiple devices, audio forwarding via a bundled sndcpy APK, system tray integration, single-instance enforcement, dark styling, and translations for Chinese, English, Japanese, and Korean. The most reusable parts of the repository are intentionally small, isolated UI and utility components rather than the main controller logic. KeepRatioWidget preserves a child's aspect ratio, MagneticWidget snaps a toolbar to window edges, MouseTap provides a clean cross-platform abstraction over Win/X11/Cocoa mouse-grabbing APIs, SingleInstance uses a local socket to prevent duplicate launches, and IconHelper loads Font Awesome icon glyphs. The video rendering widget demonstrates hand-written OpenGL shaders for YUV-to-RGB conversion, and the encoder preset registry hints at a factory-style extensibility pattern. Maintenance is active, with recent commits, release tags, and CI workflows for Windows, macOS, and Linux. However, there is measurable technical drift: the code contains many Qt5/Qt6 conditional blocks, deprecated Qt APIs such as QRegExp appear in the UI, the Ubuntu CI container is older (20.04 / Qt 5.15.2), and the README heavily promotes the author's commercial successors. The project is not a data/research repository; it is a practical desktop tool with no data pipelines, notebooks, or analytical artifacts.