At present, Thailand has entered a complete aging society and will enter a super aging society in 2031. From an increasing proportion of elderly people, but the number of people of working age remains the same or decreases, resulting in the elderly having to work more burdens, including the extension of the retirement age to replace the missing working-age people. Therefore, it is important to take care of the welfare of the elderly to have a better life. In Thailand, there is no mobile application to help care for the welfare of the elderly. This pre-experimental study in the design and development of mobile applications for the welfare of the elderly. The objective was to test the effectiveness of a mobile application in the elderly welfare care. The mobile applications used as research tools were assessed for quality in terms of both usability and design by three experts. The influence on mobile application usage was assessed by a sample population of 50 elderly residents in Bangkok. The results showed that the sample population was satisfied. in application design It has an average of 4.04, is good and in terms of performance. A mean of 4.00 is good. This suggests the possibility to apply mobile application for the welfare of the elderly.