Inclusion Criteria:  Attention Function Index (AFI) score of < 7.5 Are able to read, write, and understand English Ability to understand an electronic informed consent document, and the willingness to sign it Have a Karnofsky performance status (KPS) score of >= 50 Have access to WiFi connection  Exclusion Criteria:  Receiving active treatment for cancer recurrence Have significant cognitive impairment Have sensory or motor deficits that prevent them from doing the assessment and using the application