Factors influencing user's adherence to physical activity applications: A scoping literature review and future directions.

•A review of the factors influencing PA app adherence and a classification framework for all identified factors are provided.•Factors influencing user’s PA app adherence in developing countries are rare in prior research.•Identifying reasons for users’ adherence or nonadherence during different times requires longitudinal studies.•Some factors are most often found to positively influence PA app adherence, while others are found not.•Studies assessing the causality between factors and PA app adherence are rare in prior research.