This Shiny App is part of the supplementary materials of paper Excess mortality in Europe during the 2020 COVID-19 pandemic: a multi-country study at the sub-national level by G. Konstantinoudis et al. (2022). This paper estimates the excess mortality caused by the COVID-19 pandemic during 2020 in five European countries: England, Greece, Italy, Spain and Switzerland. The paper has been published in Nature Communications.