ZOE Health Study

154K reviews
Content rating
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About this app

Help critical research into major health conditions by reporting how you feel each day in the app, even if you feel well.

Join over 800,000 people in supporting scientists to help our national health services fight the biggest health issues of our generation. Millions joined ZOE to fight COVID-19 with their mobile phones from home. Why stop there?

The ZOE Health Study is an evolution of the ZOE COVID Study, which has data quoted in thousands of news stories and published in dozens of scientific papers. We’ve already proven that our approach can rapidly advance scientific understanding and public knowledge.

With our technology and dedicated Contributors, our research will look at how altering your day-to-day behaviour could impact your immune system and reduce the risk of developing major diseases from cancer to dementia. You will be directly helping us to develop an early warning system for disease detection which will help to save lives.

This app (formerly known as the ZOE COVID Study) allows you to help others but does not give health advice. If you need health advice please visit the NHS website.


The data that you give us for our research into diseases other than COVID-19 will be restricted to King’s College London and ZOE only unless you opt-in to share it more widely in the future.

Your data is protected under GDPR, and can only be used for the purpose that you consent to.

We’ll never sell your data and we’ll be transparent about developments we make to products that advance human health. Please read our privacy policy for more information.


You will be asked to share some general information, such as your age, and some health information, such as whether you have certain diseases.


We will ask you to set up your ‘Usual Self’, this is your personal health baseline and will indicate any symptoms you may frequently suffer from. By telling us how you feel each day and reporting any changes in your usual symptoms, we will be able to relay valuable data to scientists.


We’ll conduct voluntary participant studies to see how lifestyle changes might work for you as individuals. We’ll play back insights from the studies to the community that will enable you to live your healthiest life and reduce your risk of developing major diseases.

In-depth studies into issues such as menopause and cancer will uncover detailed new findings to advance our understanding of major conditions and diseases. This app is designed and built by ZOE Global Limited, a health science start-up, in partnership with doctors and scientists at King's College London.
Updated on
26 Sept 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region and age The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

150K reviews
Schuyler Judd
24 November 2023
It won't send notifications on my Pixel 8 Pro. I checked all the settings, there's a separate one for Android 14. Tapped on it, but nothing seems to happen. I've missed several days because of this. Also, when I sign in, show password is frozen and won't show. Still no fixes. Sigh.
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Philip Withnall
11 January 2023
The app has always been easy to use, and the latest update seems to successfully fix crashes in it. The only problem now is that the app is using 500MB of storage for no discernible reason. On an 8GB phone, that’s quite a lot of the available storage! Could it be made less space-hungry please? Since late 2022 the UI has been incredibly slow to use, taking 5s to respond to touch input. It’s now infuriating to use. Please fix this!
29 people found this review helpful
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Connor Monke
16 February 2021
Overall, a very good app and excellent that scientists are using this app to honestly gather information that can help safely end this pandemic sooner! That (and to a significantly lesser extent, the clean visual design) is what the five stars are for. Just please make sure the experience of the interface is reliable (free of lags or delays for example). It also might be nice if you could add a big green check mark for a "daily check-in completed" thing. Keep up the good work and wear a mask!!!
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What's new

Minor tweaks and fixes for ZOE's Ferment Experiment