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COCOA - COVID-19 Contact App

Publisher: 厚生労働省健康局
Price: Free

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App Description

This app is for use in Japan.
Officially provided by the Ministry of Health, Labour and Welfare of Japan (MHLW), this app notifies you of close contact with COVID-19 positive users to help the government and healthcare organizations contain the spread of COVID-19.
The functions and design of this app are planned to be updated. Please install the latest version that MHLW will announce on their website.

■ What you can do
The app recognizes close contacts (within 1 meter, 15 minutes or more) between smartphones running this app. If you test positive for COVID-19, you can register anonymously in this app. If you have been in close contact with a user who tested positive, the app notifies you of potential infection and provides guidance to protect your health.

■ Privacy
No personal information such as your name or phone number is collected. No geolocation data including GPS data is collected.
All data is encrypted and saved locally on your smartphone. All data is automatically deleted after 14 days. Your movements cannot be seen in any way by anyone including government agencies or third parties.
You can stop recording close contacts anytime. Turn on recording the settings in the app or delete the app.

■ Recording ‘close contact’
This app records ‘close contact’ across Android and iOS devices by using Bluetooth and Exposure Notification API provided by Google/Apple.
When you run this app, each smartphone generates a random code. This code changes every 10-20 minutes
When smartphones running this app are in close contact, they exchange random codes. Received codes are stored only on the devices.

■ Close contact notifications
Users who tested COVID-19 positive, can choose to share the random codes that their devices have sent out. Each device periodically checks if it has previously encountered any of the shared codes. If the code shared by a COVID-19 positive user matches with a code stored on your device, you will be notified that you have been in close contact with COVID-19 positive user and provides guidance to protect your health.
To receive notifications of close contact with COVID-19 positive users, you need to download this app and enable exposure notification function on OS settings. The app only works with others who have the official app installed.

■ Guidance to protect your health
In the app, you can also check the list of dates you were in close contact with COVID-19 positive users during the last 14 days. If you have more than one close contact, please use the symptom checker provided in the app to receive appropriate guidance such as contact information of healthcare organizations. Depending on the symptoms, you will be advised to take a COVID-19 test. You will also find instructions if you want to reach out healthcare organizations by phone.

■ When you tested positive
When you are tested COVID-19 positive, please voluntarily register so in the app to notify other users of potential infection. When healthcare organization registers your positive test results to “The Health Center Real-time Information-sharing System on COVID-19” (known as HER-SYS) provided by MHLW,  a processing number is issued to you. Entering this processing number in the app will allow you to register your positive test result.

■ Stop or delete close contact recording
You can stop recording close contacts with other users anytime by changing app settings. You can delete close contact history (14 days) anytime by deleting the app.

■ Availability
This application will be available until COVID-19 ends.

■ Supported OS versions
Android 6.0 or higher

■ FAQ & Contact
FAQ (Japanese):

■ Privacy Policy & Terms of Use
Privacy Policy(English):

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App Reviews and Ratings

Find out what users think of COCOA - COVID-19 Contact App by reading the reviews and checking the rating.


18625 ratings

通知も来ないし、生ログ確認しないとわからないし、陽性者と接触があった旨Exposure Notification のログに引っかかっても保健所は誤報の可能性が高いと検査もしてくれない。アプリも EN API も運用体制も最低だと思います。アンインストールします。

Feb 17, 2021


Feb 21, 2021

I had this app deleted after it finding out it wasn't working properly since Sept last year, meaning you wouldn't get notifications even if you came into contact with someone. Even now, you won't get notifications unless you open the app daily. This is an unbelievable waste of taxpayers money and I really hope someone is held accountable for this massive failure.

Feb 18, 2021

Worse than a fax machine. I've been using this app diligently since release, only to find out it hasn't been functioning for Android or iPhone for months. A complete wasted effort on part of developers and the government sponsors. These apps have proven critical in New Zealand and other countries in the fight against covid, so it's a shame that Japan didn't take it more seriously.

Feb 21, 2021

Is it just a mockup?

Feb 25, 2021

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