From the app’s FAQs -
“The COVID symptom tracker was created by doctors and scientists at King's College London, Guys and St Thomas’ Hospitals working in partnership with ZOE – a health science company.
The app will be used to study the symptoms of COVID-19 and track the spread of this virus. This research is led by Prof. Tim Spector, professor of genetic epidemiology at King’s College London and director of TwinsUK”
WORD ASSOCIATION - 9th May 2026


Yes, there will be a minimum version needed, apps can’t work on every operating system, so as you say it could be your phone is too old.
