More than one and a half million people in the UK have downloaded the COVID-19 Symptom Tracker App developed by King’s College London, together with Guy’s and St Thomas’ NHS Foundation Trust, the National Institute of Health Research Guy’s and St Thomas’ Biomedical Research Centre and healthcare start-up ZOE Global LTD.

Half (49%) of app users are 18-39 (26% of the population), with the lowest reporting group (9.5%) being aged 60+ who are most at-risk and represent 23.8% of the UK population. The team are focussed on making the experience as usable as possible by all ages, especially those classified as high risk by the NHS.

Users’ data is held securely and in accordance with General Data Protection Regulations (GDPR) and with strict data security measures in place.

The free monitoring app was developed as a partnership between researchers at King’s and health data science company ZOE - itself a spin-out from King’s - and is widely available, at no cost, to health staff and the general public who wish to contribute to this research. Clinicians from St Thomas’ Hospital have also helped advise on symptoms.

The app is currently only available in the UK, but will be launched in the next few days in the US.