This research was intended to 1) develop web applications for community activity management and 2) study the level of efficiency and technology acceptance of web applications, community activity management, a case study of Ban Namjan, Kamalasai District, Kalasin Province. The sample group used in the study comprises 2 groups: 3 information technology and software development experts to assess system performance, and 20 users in the Ban Namjan community area to study technology acceptance. Research tools include web applications developed in the Node.js environment with the Supabase database, performance appraisals for experts, and the technology acceptance assessment model. The statistics used in data analysis were the mean and the standard deviation.
      The results showed that 1) the developed system consists of 2 main functions, namely part 1 for community members that support activity-detailed inspections, activity registration, and news tracking. And part 2 for administrators who can manage member information, manage activity content, and monitor the situation for joining activities. 2) The evaluation of system performance by experts found that the efficiency of the system overall was at a very good level (= 4.55, S.D. = 0.53).Regarding the technology acceptance, it was found that users have accepted it overall at a high level ( = 4.25, S.D. = 0.82).