 The study aims to examine the alignment of physical activity and exercise advice provided by mobile apps during pregnancy with current evidence-based guidelines, as well as the delivery format, features and credentials of the app developers. The results show that only 11% of the apps provide this information in line with current evidence-based guidelines, none of the app's screen users for contraindications to physical activity and exercise during pregnancy, and most lack appropriate personalization features. There is a need to improve the quality of these apps to ensure women are appropriately supported to engage in exercise and minimize potential risks to both mother and child. This article was authored by Melanie J. Heyman, Christy Lee Alfrey, Kim Waters, and others.