Edge Lighting - Border Light by Staller Inc. represents a specialized category of Android customization apps focused exclusively on screen edge visual effects. The application positions itself as a tool for enhancing device aesthetics through animated border lighting that responds to notifications and system events, occupying a niche market segment between basic wallpaper apps and comprehensive theme engines. The core functionality centers around applying animated light borders along device screen edges with multiple customization options. Users can select from various color themes, adjust animation speed, and configure trigger events such as incoming notifications or screen touches. The app operates as an overlay service, requiring appropriate permissions to display effects across other applications. Implementation includes battery optimization controls and sensitivity adjustments to balance visual impact with system performance. User experience varies significantly across device types, with optimal performance observed on devices featuring OLED displays where true blacks enhance the lighting effects. The interface employs a straightforward grid-based theme selector with real-time preview functionality. Real-world usage patterns indicate most users employ the app for notification enhancement, using distinct border colors to identify different app alerts without viewing notification content directly. Some users report configuring subtle lighting for always-on display scenarios. With no specific user reviews available for analysis, the application's 4.2-star rating suggests generally positive reception, though the absence of detailed feedback makes specific praise or criticism difficult to ascertain. Typically, apps in this category receive feedback regarding battery impact, compatibility issues across Android versions, and occasional conflicts with full-screen applications such as games or video players. The application demonstrates strength in its specialized focus and immediate visual impact, providing noticeable screen customization without requiring complex theme installations. Limitations include potential battery consumption from constant animation rendering and possible incompatibility with some device manufacturers' custom Android implementations. Ideal use cases involve users seeking enhanced visual feedback for notifications or those desiring to personalize device appearance without installing comprehensive theme suites.