The national and local versions of the color-coded health app are major COVID-19 control tools in China — a green code guarantees access to public areas and services, whereas a red code serves as a warning of COVID infection or possible infection.

依据彩色编码的健康应用程序有国家和地方两个版本，这是中国控制新冠病毒的主要工具——绿码确保能进入公共区域和服务，而红码用于警告新冠感染或可能存在感染风险。