Koronavilkku (Swedish:Coronablinkern, meaning "Corona signal" in English) was aCOVID-19 app and adigital contact tracingmobile app developed by theFinnish Institute for Health and Welfare to inform citizens of when they may have been exposed to theCOVID-19 virus. The app is inactive as of 1.6.2022.[1] The free app became available for download onGoogle Play andApp Store on August 31, 2020, and was downloaded one million times in the first day.[2] By November 5, 2020, the app had been downloaded more than 2.5 million times.[3]
The app was designed so that it did not tell the user the source of a potentialinfection, in order to ensurepersonal privacy. In a case of possible infection the users would receive a code that was entered into the application. Then the app notified those who have been in proximity to the infected individual that they may also have been exposed to the virus. The app did not collect anypersonal information such as identity or location. The regularly changed andrandomly generated codes guaranteed that the users could not be directly identified from the codes.[4][5]
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