Hippy is a cross-platform mobile application framework developed by Tencent that enables developers to build native mobile apps using JavaScript with React or Vue. It provides a JS driver layer that communicates with native renderers on Android, iOS, OpenHarmony, and Web via a bridge system. The architecture is modular: a DOM layer manages the virtual tree and layout (using Taitank or Yoga), native renderers create platform-specific UI components, and a virtual file system (VFS) handles resource loading. The framework includes a full devtools backend implementing Chrome DevTools Protocol for debugging, performance monitoring, and DOM inspection. Key entry points include the JS bootstrap (hippy.js), native engine managers (HippyEngine on Android, HippyBridge on iOS), and the JS framework adapters (hippy-react, hippy-vue, hippy-vue-next). External dependencies include V8, Hermes, JSC, or JSH JavaScript engines, and platform-specific SDKs (AndroidX, UIKit, ArkUI). The codebase is large and actively maintained, with multiple renderer implementations and both Vue 2 and Vue 3 support, though some duplication and deprecated code exist.