ZOE Health Study 12+

Global health issues

Zoe Limited

Designed for iPad

    • 4.7 • 156.8K Ratings
    • Free



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.

What’s New

Version 5.1.0

Minor tweaks and fixes for ZOE's Ferment Experiment

Ratings and Reviews

4.7 out of 5
156.8K Ratings

156.8K Ratings

Effpeegee ,

UX design fantastic

Kudos to everyone who created this app. When you take time to figure out the button placement (no matter which phase of the vaccination program you’re on), you have a complete team. I.e No matter if you’ve had the jab or not, the default buttons you need to tap are on, are in the same place. This makes it easy to log very quickly on a daily basis. Only one problem. Twice since May 2020 the app has stopped daily notifications (last one in past 2 weeks). I rely on the alerts and have just missed 5 days of reporting. iOS settings all ok and app settings still set on. Only way to restart alerts is to delete the app and reinstall. From experience, typically this sort of issue is very hard to find.
THANKS FOR IMPLEMENTING THIS: MAP IS ONE SCREEN BACK - AT THE TOP, PERFECT. One lowly request: I like to look at the UK map after each report, to see how my area is doing. Would be great to take me straight there or have a button - and zoom in on my area based on postcode. Not very important but would be the icing on the cake.
Congrats to the team. Take them out for meal/drinks when you can!

KathrynED1993Bris ,

Great idea but a little flawed.

I find the idea of this app fantastic! It will be extremely helpful in tackling this disease and documenting lots of data. My main issue and area for suggestion is for the questions relating to whether you think you have had it. I myself believe my partner and I have had Covid-19 but despite me coming into possible contact with the disease I was not deemed ‘high risk’ by NHS 111 and was therefore not tested. This is where I think the app falls short of being incredibly helpful to scientists and data analysts. Where you ask ‘do you think you have had Covid-19?’ You should then ask what symptoms the person had, how long they lasted for, had they come into potential contact with someone with Covid-19 and how long before symptoms started presenting, and ask for a quick diary of events and a summary as to why they think they had it. The reason for this is you will get a better picture of incubation time, access fully the extent of how many were a 90%+ sure they had it, how many it may have been a cold, and based on age range, location, underlying illness you can find out survival statistics, severity of symptoms and get a rough idea of possible herd immunity going on. Basically your data would be more thorough, extensive and she’s better light on this disease which may be useful to the NHS, scientists and government. With all that said I still encourage people to use this app and keep up to date with how they feel in these uncertain times!

HotelChocolate ,

More options for fatigue especially to flag post viral fatigue

I think this is a great idea and well done for doing this really important work. I have been logging my symptoms since early in my Covid illness and I’m finding that there’s not really enough grades of options in some of the fields now that I’m improving. In particular, for fatigue, there is quite a lot between mild fatigue, and struggling to get out of bed. I can get out of bed now, but I wouldn’t describe my condition as being mild fatigue, it’s still pretty debilitating, and I’m actually looking forward to only having mild fatigue! Could you add an option of moderate fatigue? I can get out of bed and make myself tea or have a shower, but this makes me so tired I then have to go and lie or sit down again, I don’t consider this to be mild. I’m days if not weeks away from getting back to anything like normal.
There is speculation that some people will go on to suffer from long term post viral chronic fatigue after Covid. I think this app could be able to spot this trend if you adapted the questions.
Could you also add muscle weakness as an option. Now that I am able to move further from my bed, I’m finding that my legs and arms are pathetically weak compared to normal. I expect that’s partly deconditioning from having spend two weeks in bed, but it may be also part of post viral fatigue and is worth tracking.

App Privacy

The developer, Zoe Limited, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Linked to You

The following data may be collected and linked to your identity:

  • Health & Fitness
  • Contact Info
  • Sensitive Info

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data

Privacy practices may vary based on, for example, the features you use or your age. Learn More

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