COCOA - COVID-19 Contact App 4+

Japan MHLW official

Ministry of Health, Labour and Welfare - Japan

    • 1.9 • 99 Ratings
    • Free

iPhone Screenshots


The service of Contact-Confirming Application COCOA will be discontinued.
Please update to the lastest version of this app and start the procedure to end the service.
Regarding Service Discontinuance, please refer to the below URL.

This app is for use in Japan.

■ Supported OS versions
Android 6.0 or higher

■ FAQ & Contact
FAQ (Japanese):

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

What’s New

Version 3.0.0

・Announcement of Service Discontinuance is displayed on various screen. (including welcome screen)
・A function to stop application and OS background refresh has been added.

Ratings and Reviews

1.9 out of 5
99 Ratings

99 Ratings

I_cycle ,

Network Connection Error

If you want to (or must) use the Exposure Notification system on iOS in Japan, you must use this app. If you attempt to register in the app before you arrive, you will get an unhelpful “Network Connection Error”.

The app will not let you proceed unless you are connected via a Japanese network. Note that international roaming on a foreign cellular network will not work. You must connect via a WiFi network in Japan or via a Japanese cellular network.

yoyookhss ,

Network connection error issue resolved

A lot of people in reviews comments they have network connection error after accepting terms of use. The Japanese Ministry of health website said you cannot use it if you are not in Japan. I assume you will be able to use it once you landed in Japan.
I hope this helps many of you having this issue.

Molanda Zu ,

Needs verification

Thank you for providing the app.

A major limitation is the lack of any feedback that the app is functioning properly and recording close contacts. It is like having a smoke detection without a test button.

I believe showing a count of recent contacts over a period of time does not raise any privacy concerns while at the same time adding a bit of confirmation.

App Privacy

The developer, Ministry of Health, Labour and Welfare - Japan, 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 Not Linked to You

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

  • Other Data

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

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