WhenToShop is a free online tool from Mastercard, based on continuously updated data, that allows consumers to plan their visit at a grocery store for the time when it is least busy. During the Covid-19 pandemic, it helped Poles to do their daily shopping in a safe way, in line with the social distancing rule. The tool, first made available in May 2020, has been successively developed by adding a section with epidemic recommendations for visiting different types of retail and services outlets, as well as by providing a separate site for Carrefour customers.