Hoia

HOIA is the official COVID-19 contact tracing app for Estonia. It is owned by the Estonian Health Board. The app has been created in collaboration between the Estonian Health Board, the Ministry of Social Affairs, the Health and Welfare Information Systems' Centre and a voluntary consortium of Estonian companies.

The application uses Bluetooth and the Google Exposure Notification API to notify you about exposure to people diagnosed with COVID-19. This way the app allows you to take care of yourself and your loved ones while limiting the spread of the disease in Estonia. The app has been developed according to privacy preserving principles and the notifications sent through the app do not disclose the identity of the infected person. Likewise, only you will know if you have been exposed to people diagnosed with COVID-19.

Phones that use the app register the Bluetooth signals from other nearby phones. If the signal is sufficiently close and long enough, an anonymous code referring to a close contact will be stored in the phone. If a person now confirms their infection with the HOIA app, the anonymous codes on their device will be uploaded to a central server where all users can download them. It is not possible to identify a person based on an anonymous code. The user’s phone compares whether the infected person’s anonymous code matches a code previously stored on their phone. If so, the user is considered to be a close contact and they will be notified with instructions. It will not be revealed to the user who the infected person was with whom they were in contact with, or any other information that would allow the indirect identification of the infected person.

The app has been developed in collaboration with the following Estonian companies: ASA Quality Services, Cybernetica, FOB Solutions, Fujitsu Estonia, Guardtime, Heisi IT, Icefire, Iglu, Mobi Lab, Mooncascade, Velvet.
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What's New

We've added the possibility of marking the represented person as infected.
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Additional Information

Updated
November 15, 2021
Size
5.5M
Installs
100,000+
Current Version
1.4.6
Requires Android
6.0 and up
Content Rating
Everyone
Permissions
Offered By
TEHIK
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