Inclusion Criteria:  ≥18 years of age living in the community, own a smartphone with internet access, communicable in Cantonese, type in Chinese or English, with a confirmed diagnosis of CAD.  Exclusion Criteria:  enrolled to a structured centre-based or home-based cardiac rehabilitation program, (2) psychiatric problems, impaired cognitive functioning (i.e. Abbreviated Mental Test ≤6), and terminal disease with life expectancy < 1 year.