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This study aims to investigate the effects of the acute phase of the COVID-19 crisis on stress, mood, and behaviour using an ecological momentary assessment approach via a smartphone-app. The acute phase of the crisis in the spring of 2020 has been characterised by widespread social and economic disruption as many countries try to reduce the spread of the disease. We will explore the acute effects of the crisis on people’s stress and mood (1), and how these potential changes in stress and mood are linked to four types of behaviours: reward seeking (2), music listening (3), social interactions (4), and prosociality (5).