The project addresses the need for an at-home multiplex rapid testing device to differentiate between COVID-19, Influenza, and RSV, given their overlapping symptoms. Utilizing lateral flow immunoassay technology, the device offers simultaneous detection of these viruses in less than 15 minutes, providing a convenient and efficient test for users, especially the elderly and homebound individuals. The research investigates the limitations of current testing methods and explores the potential of improving at-home testing by using multiplex assays. Our design goals prioritize multiplexing ability, efficiency, smartphone compatibility, and convenience, while significant constraints such as cross-contamination, cost, and time are considered. Through innovative technology and user-friendly design, our device aims to provide accessible and reliable diagnostics, addressing the challenges posed by similar symptoms across different respiratory viruses.