Inclusion Criteria:  Be over 18 years old Be at least primary school graduate Volunteering to participate in research Being diagnosed with gynecological cancer for the first time (no cancer recurrence) Receiving at least one course of chemotherapy and continuing chemotherapy treatment Be Eastern Cooperative Oncology Group (ECOG) performance scale score below 3 Be not have a psychiatric illness Owning a smartphone Be have internet access and have used any mobile application before  Exclusion Criteria:  Be have any psychiatric illness Be have not yet received or completed chemotherapy treatment Be Eastern Cooperative Oncology Group (ECOG) performance scale score of 3 and above