This developmental research aimed to examine the challenges in learning intravenous fluid administration and to develop and evaluate the effectiveness of a learning media in the form of an application for nursing students. The ADDIE Model framework was employed, comprising five steps: 1) Analysis, 2) Design, 3) Development, 4) Implementation, and 5) Evaluation. The sample consisted of 30 third-year nursing students from Boromarajonani College of Nursing, Chiang Mai. The research tools included the "BCNC Smart IV" application developed by the researchers, an in-depth interview guide exploring experiences in learning to care for patients receiving intravenous fluids, a knowledge assessment on intravenous fluid administration, an evaluation of the quality of the application-based learning media, and a satisfaction survey on the use of the BCNC Smart IV application. Qualitative data were analyzed using content analysis, while quantitative data were analyzed using descriptive statistics and the Wilcoxon Signed Rank test. The results showed that after using the BCNC Smart IV application, the sample group had a significantly higher average knowledge level compared to before its use (p-value < 0.0001). The overall evaluation of the quality of the application-based learning media was at a very good level (M = 4.39, SD = 0.41), and the sample group expressed a very high level of satisfaction with the use of the application (M = 4.39, SD = 0.41). Therefore, the BCNC Smart IV application can enhance nursing students' knowledge about intravenous fluid administration, facilitate convenient content review, and be disseminated to benefit nursing education and learning in other institutions.