This research aimed to: (1) develop a web application for monitoring and analyzing stress behavior among adolescents, (2) assess the efficiency of the developed web application, and (3) evaluate user satisfaction with the system. The research employed an applied research approach and adopted the Software Development Life Cycle (SDLC) methodology for system development. The programming languages used for developing the web application include HTML, CSS, JavaScript, and PHP, with MySQL as the database system. The development tools comprised Visual Studio Code, XAMPP, phpMyAdmin, and Figma. The system efficiency was evaluated by five experts in June 2025, while user satisfaction was assessed through data collected from 250 participants selected by convenience sampling between July and August 2025.
       The research findings revealed that: (1) the developed system was capable of managing three primary components: general users, members, and administrators; (2) the overall efficiency evaluation was rated at a very good level, with a mean score of 4.59 and a standard deviation of 0.61; and (3) the overall user satisfaction was rated at a good level, with a mean score of 4.48 and a standard deviation of 0.63. The research findings demonstrated that the developed web application was effective and received positive feedback from users. Moreover, the system proved useful for monitoring and analyzing adolescent stress-related behaviors. However, the system had not been integrated with mental health professional systems.