Koronavilkku application will tell you if you have been exposed to coronavirus – Download the app!


Koronavilkku is a contact tracing app produced by the Finnish Institute for Health and Welfare (THL) to help you find out whether you may have been exposed to coronavirus. If you have a coronavirus test and are diagnosed as infected, you can use the app to share this anonymously with those you have been in close contact with. Your privacy is strongly protected.

How to use the application

  1. Download the free Koronavilkku app from an app store (e.g. Apple App Store and Google Play) to your mobile phone. The app works automatically in the background without affecting phone use or draining the battery.
  2. The phones of Koronavilkku app users send a randomly generated code to each other when they come into close contact. The phone stores anonymous information about the contact.
  3. If you have been close to someone who reports that they have been taken ill, you will receive an alert of potential exposure. If you have been diagnosed with coronavirus, the health service will send you a key code. When you tap this code into the app, you anonymously alert other Koronavilkku app users who have been close to you of potential exposure.

Personal data

Koronavilkku does not store your name, date of birth or contact information. It cannot identify you or the people you come into contact with. The app does not collect information about where you are.

How the app works

The app transmits information that the app is working to a server. It also forwards information about whether you have been potentially exposed to infection. All communication between Koronavilkku and the server is encrypted.

The information is stored anonymously on a server in Finland. The server is managed by public administration actors. The information is deleted when no longer required.

Use of the app is voluntary

Use of Koronavilkku is not mandatory and you can stop using the app at any time by deleting it from your phone.

You can find more information about this application at: koronavilkku.fi/en