Inclusion Criteria:  over 18 years old; speaks English fluently; is able to independently consent; has adequate corrected vision to use the ECA system (based on a 1 minute ECA functional screener deployed over the web); has adequate hearing to use the ECA system; owns a recent model iPhone or Android smartphone.  (6) do not meet current Boston Public Health commission guidelines for SARS-CoV-2 vaccination; (7) do not meet current Boston Public Health commission guidelines for Influenza vaccination.  Exclusion Criteria:  they are not able demonstrate comprehension of the research study; they are unable to use the screener