The IoCare app is an IoT-based app that offers optimized air and water to customers through COWAY's air and water purifiers and analyzes customers' lifestyles to solve problems. With its overall concept of "See, tell and change," the app visualizes invisible air and water and offers solutions. Air care is indicated in four stages (good, average, bad and very bad) through main screen color changes based on real-time weather and air status. External and internal air are intuitively expressed through circular UI. Water care is expressed realistically through the interaction of water flowing into the cup with added drinking purpose effects.