The fast spread of coronavirus (COVID-19) around the world has put health services under an enormous strain. Turning to digital means for collating data on the spread of the virus, the associated symptoms, as well as the routes through which it may be spreading has been a common response. The situation, the associated technologies and the practices of their use vary across the globe and evolve rapidly. This report provides a global snapshot of the different types of technologies in use or in development for surveillance of COVID-19 at the beginning of April 2020. By the time this report is published, the situation will have developed further. The body of the report presents short descriptions of a selection of different apps from around the world. More detailed data tables are in Appendix 1 and include references used.