Throwback is a mobile application developed by UC Berkeley students Peter Kim and Kevin Chen that allows users to relive past experiences by connecting through Facebook to view their historical posts and photos on a specific calendar date. Initially a web application, Throwback transitioned to a mobile platform using the Ionic framework, which appealed to Kim and Chen for its Angular compatibility and the ability to create a responsive, native-like user interface with ease. The application, available on both iOS and Android, targets users interested in nostalgia, particularly high school and college students, and benefits from Ionic's UI components and platform detection features that simplify cross-platform development. The developers chose Ionic to avoid maintaining separate code bases for iOS and Android, leveraging HTML5 for efficient cross-platform support, which allowed them to focus on building a single code base and making minor tweaks for each platform.