REACH is a cloud-based software application designed to automate the access, processing, and summarization of large volumes of satellite Earth observation data for public health purposes. It addresses challenges faced by public health practitioners in low- and middle-income countries, such as limited internet bandwidth and computational resources. Operating on the Google Earth Engine platform, REACH conducts extensive data processing in the cloud, allowing users to download only concise data tables, making it suitable for resource-limited environments. The software aims to provide an accessible solution for public health professionals to utilize satellite data for health applications, enhance early warning systems (generate the necessary environmental data inputs (temperature, precipitation, vegetation indices) for malaria forecasting models, such as the EPIDEMIA system. It also aims to eliminate the need for specialized knowledge in satellite data processing or high-bandwidth internet. Its focus areas include environmental health and communicable diseases, targeting the general population.