Background and Objective: To describe a digital platform to support the epidemiological surveillance of COVID-19 (C19) in primary health care (PHC) services, in two large Brazilian capitals. Methods: The study “Expansion of testing, quarantine, e-health and telemonitoring strategies to fight against the C19 pandemic in Brazil (TQT-C19 Study)”, developed in the 1st semester of 2022 a digital platform based on epidemiological surveillance actions, normative from international organizations and Brazilian organizations, to be incorporated into the Brazilian National Health System. The design of the platforms scope and tests were carried out with the participation of researchers, health professionals, managers, and the information technology team. Results: The digital platform has been used by PHC clients, health professionals, and managers of health units and the central level to support C19 epidemiological surveillance in the PHC territory. The platform provides information management and access levels according to the users registered profile. This tool was created with a global model and can be used by other PHC services across the country, as well as for other diseases such as Zika, influenza, dengue, monkeypox, etc. It is divided into modules: a panel of indicators for epidemiological surveillance and real-time mapping of the situation in the territory; electronic medical record with test results, telemonitoring, and contact tracing; communication, providing reliable information; and logistics for controlling the stock and receipt of samples. Conclusions: The development of the digital platform is focused on the testing needs of C19 in the PHC, jointly defined by the researchers and professionals from the municipal health departments. In this way, the TQT-C19 platform could be another instrument in the response of C19 in PHC services, as well as in health surveillance and management. With adaptations of other protocols and the development of specific modules, the system can be a legacy for other diseases.