Themica: Theme, Icon & Widget represents a dedicated customization solution for Android users seeking to personalize their device interfaces beyond standard manufacturer options. Developed by World Quiz, the application positions itself as an all-in-one platform for transforming smartphone aesthetics through coordinated theme packages, individual icon sets, and functional widgets. The application's core functionality centers around three main customization pillars: complete theme packages that coordinate wallpapers, icons, and color schemes; individual icon sets allowing selective app icon replacement; and customizable widgets providing both aesthetic and functional enhancements. The library includes categories ranging from minimalist designs to anime-inspired artwork, with search and filtering capabilities helping users navigate the extensive collection. Implementation typically requires users to apply changes through their device's native settings or supported launcher applications, though the app provides guided instructions for this process. User experience demonstrates a straightforward interface organized around discovery and application of customization elements. The main dashboard presents curated collections and trending themes, while category browsing enables more targeted exploration. Real-world usage patterns suggest the app appeals particularly to users who frequently refresh their device aesthetics or maintain multiple themed setups for different occasions. Performance observations indicate smooth theme previewing and application, though some advanced customization options may require familiarity with Android's native customization features. User feedback trends show consistently positive reception regarding the app's entertainment value and customization capabilities. Multiple reviews from April 2025, including those from user Timarion Lamb, emphasize the enjoyable experience of wallpaper changes and theme applications, though these reviews contain limited detailed commentary. A June 2025 review from Anshika Kumar specifically notes the advertising-supported model and mentions peaceful visual results from applied themes. The 4.4-star rating suggests generally satisfied users, though the available reviews lack critical depth regarding specific technical aspects or limitations. The application's primary strength lies in its extensive library of free customization options accessible through advertising support, making advanced theming available without financial commitment. However, this model may present limitations regarding ad frequency and potential interruptions during the customization process. The app serves most effectively as an entry-point customization tool for users seeking quick aesthetic refreshes rather than deep, system-level interface modifications. Ideal use cases include casual users wanting seasonal theme changes, anime enthusiasts seeking character-themed setups, and individuals looking to coordinate their device appearance with personal style preferences without technical complexity.