The Coronavirus Pandemic Epidemiology (COPE) consortium developed the C-19 COVID-19 Symptom Tracker app for daily tracking of COVID-19 testing and symptoms. This work is lead by researchers at Massachusetts General Hospital and King’s College in London. They will work with you to provide the data collected from your study participants. Go to https://www.monganinstitute.org/cope-consortium for more information including IRB toolkits and information about cohorts currently participating. Here is an example of research using data from this symptom tracker: https://www.nature.com/articles/s41591-020-0916-2.
MIT has started a review of COVID Tracing tracker apps (different from symptom trackers, but likely to grow if proven to improve efficiency of contact tracing): https://public.flourish.studio/visualisation/2241702/