There are many 'personalized services' that provides personalized content to individuals. Coway wanted the 'personalized service UI' to be applied to the products for 2019 CES exhibition, and they selected The Grap as a partner, conducted UI work on the demonstration app that is linked to the water softener and bidet and the display that will be inserted into the water softener. IoT linkage allows users to control the product and provides intuitive usability by applying colors that change smoothly depending on the condition and icons for each mode. Also, the graph and summary of the report allows users to understand the usage habits of individuals at a glance.