This study was conducted to provide a possible solution to the unceasing problem of finding willing blood donors with the use of mobile technology and location based services. The blood donor finder application aimed to provide a means to easily locate a willing blood donor through a mobile application. Using the mixed method of conducting a research, the researchers were able to develop the application. Two groups of randomly chosen respondents participated in this study to assess the technical quality and quality of using the application. This study utilized and followed the Spiral Model with the following stages Planning, Risk Analysis, Engineering, and Evaluation. After the development of the project, the application was subjected to the assessment of Information Technology IT professionals and residents in one of the municipality in the province of Nueva Ecija, Philippines. The assessment on the technical qualities were based on the following criteria Usability, Effectiveness, Efficiency, Accessibility, and Assistive Technology. On the other hand, the assessment on the quality of using the application was based from the following criteria Perception of the respondents on the usefulness of the application, perception of the respondents on the ease of using the application, and the intentions of the respondents in using the application. In general, the application was successfully developed following the stages of the Spiral Model and the application passed the assessment made by the IT professionals and the residents with some suggested enhancements and improvements for the betterment of the application. The results of this study proved the possibility of having a blood donor finder application and such application can aid in locating a possible willing blood donors. Cris Norman P. Olipas | Elizor M. Villanueva "Dug-Uhay: A Blood Donor Finder Application" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-1 , December 2019, URL: https://www.ijtsrd.com/papers/ijtsrd29678.pdf