iPhone Screenshots


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.

■ 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.

■ How to ‘close contact’ is recorded
This app records ‘close contact’ by using Bluetooth and Exposure Notification API provided by Apple.
When you run this app, each smartphone generates a random code. This code changes every 10-20 mintutes
When smartphones running this app are in close contact, they exchange random codes. Received codes are stored only on the devices.

■ Receiving 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 operating system. The app only works with others who have the official app installed

■ Receiving 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.

■ How to register a positive test
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.

■ How to 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 of the app
This application will be available until COVID-19 ends.

■ Supported OS versions
iOS 13.5 or higher

■ FAQ & Contact
FAQ (Japanese): https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/covid19_qa_kanrenkigyou_00009.html
E-mail: appsupport@cov19.mhlw.go.jp

What’s New

Version 1.1.4

Optimized push notification's close contact criteria.
Optimized application's close contact criteria.

Ratings and Reviews

3.3 out of 5
18 Ratings

18 Ratings

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.

Murphy in Guam ,

Not enough

I wish this app was paired with more functionality. Contact teaching is okay, but unless use of this app is mandated for those people who have tested positive, it will just give us a false sense of security. How about a map showing where all infected people have been? How about real time updated stats showing infection numbers and trends? This seems to be a bare minimum effort towards placation.

washutsyhh ,

Good start

The app is very easy to use and has great English explanations. However, the screen grabs they use for examples are all in Japanese. It may be beneficial to change these to English and Chinese, whichever preferred language is selected. As of now, this is a good start for a contact tracing app and hope the government of Japan works on improving it with time.


Ministry of Health, Labour and Welfare - Japan
148.3 MB

Requires iOS 13.5 or later. Compatible with iPhone.


English, Chinese, Japanese

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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