Systematic chemical inventory management is a critical responsibility of pharmaceutical laboratories in higher education institutions to ensure continuity in teaching and learning activities, efficient resource management, and compliance with safety standards and regulatory requirements. The existing online chemical requisition system of the School of Pharmaceutical Sciences, University of Phayao, exhibited five major operational limitations: inadequate tracking of chemical usage, insufficient control of chemical withdrawal and distribution, lack of real-time inventory monitoring, insufficient data for budget planning, and limited reporting capabilities.
        This study aimed to develop and evaluate a cloud-based chemical inventory management system for eight laboratories using a four-phase Research and Development (R&D) framework, consisting of system analysis, system development, pilot implementation, and deployment. The system was developed using Google Apps Script as the primary development platform, with Google Sheets serving as the database for data storage and management. HTML, CSS, and JavaScript were utilized to design and develop a user-friendly and efficient interface employed for the user interface Content validity was assessed by three experts, yielding an Index of Item-Objective Congruence (IOC) of ≥ 0.50. The overall reliability of the research instrument was found to be excellent (Cronbach’s α = 0.96). The study participants consisted of 42 individuals, including 38 general users and 4 system administrators.
         The results demonstrated that the developed system, which comprised nine modules, achieved performance ratings ranging from good to very good among general users (mean = 4.26–4.53). Cross-device usability received the highest evaluation score (mean = 4.53 ± 0.60), while overall user satisfaction was rated at a good level (mean = 4.34 ± 0.63). System administrators evaluated both system performance and satisfaction across all aspects at a very good level (mean = 5.00 ± 0.00). The developed system effectively enhanced systematic management processes, data integrity, and real-time inventory tracking within resource-limited pharmaceutical education settings.