This research presents the development of a mobile phone and camera rental application named Quick-Rent using the prototyping method. The application aims to address the inefficiencies in the traditional rental process by enhancing transaction security, ensuring product quality, and facilitating user access. The prototyping method was chosen due to its ability to allow developers to evaluate and improve features based on user feedback from the initial design phase. The system features were modified based on user needs analysis, and the implementation process along with seven blackbox testing scenarios confirmed the validity and usability of these features. The application was developed with a focus on user engagement and decision support system integration. The system design used Unified Modeling Language (UML) to describe processes and interactions. The use case diagrams identified key processes such as registration, login, item search, rental order, and item management. The activity diagram outlined the flow of activities from item selection to rental confirmation. The system implementation included various interface pages such as registration, logout, main page, rental success, return goods, profile, and admin main page. The system was tested using blackbox testing, which confirmed that all functionalities operated as intended. The results demonstrated that the prototyping method effectively enabled iterative customization and enhancement of features based on user feedback, resulting in increased user satisfaction and trust in the system. The application successfully meets the functional requirements, providing a user-friendly and efficient experience for users. The study highlights the significance of user interaction in ensuring that the product is both responsive and satisfying. The implementation of the prototyping method in the development of the Quick-Rent application validated its effectiveness in creating a rental solution that is responsive to user needs and enhances customer trust.This research presents the development of a mobile phone and camera rental application named Quick-Rent using the prototyping method. The application aims to address the inefficiencies in the traditional rental process by enhancing transaction security, ensuring product quality, and facilitating user access. The prototyping method was chosen due to its ability to allow developers to evaluate and improve features based on user feedback from the initial design phase. The system features were modified based on user needs analysis, and the implementation process along with seven blackbox testing scenarios confirmed the validity and usability of these features. The application was developed with a focus on user engagement and decision support system integration. The system design used Unified Modeling Language (UML) to describe processes and interactions. The use case diagrams identified key processes such as registration, login, item search, rental order, and item management. The activity diagram outlined the flow of activities from item selection to rental confirmation. The system implementation included various interface pages such as registration, logout, main page, rental success, return goods, profile, and admin main page. The system was tested using blackbox testing, which confirmed that all functionalities operated as intended. The results demonstrated that the prototyping method effectively enabled iterative customization and enhancement of features based on user feedback, resulting in increased user satisfaction and trust in the system. The application successfully meets the functional requirements, providing a user-friendly and efficient experience for users. The study highlights the significance of user interaction in ensuring that the product is both responsive and satisfying. The implementation of the prototyping method in the development of the Quick-Rent application validated its effectiveness in creating a rental solution that is responsive to user needs and enhances customer trust.