ChromoCare is a thermochromic ink made from microcapsule particles. It changes color in response to ambient temperature, bringing canvases and walls to life. This innovation offers three key features: (1) Zero-energy alerts: It provides low-interference visual warnings without requiring power or lighting. (2) Smart home integration: It works with conductive switches and IoT devices to trigger ventilation or regulate equipment when abnormal temperatures are detected, enhancing home safety. (3) Therapeutic ambience: Its cloud-like color transitions create a calming atmosphere that supports relaxation and sleep for children and pets. Unlike conventional sensors, ChromoCare has been validated in smart home and artistic decor settings, showcasing its innovative value for senior care as well as child- and pet-friendly environments. Future applications include batteries, chargers, and phone cases that visually alert users to overheating.