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COVID-19 apps are mobile software applications designed to aid contact tracing in response to the 2019-20 coronavirus pandemic, i.e. the process of identifying persons ("contacts") who may have been in contact with an infected individual. Example proposal for a location-based COVID-19 contact tracing app: Contacts of individual A (and all individuals using the app) are traced using GPS co-localisations with other app users, supplemented by scanning QR codes displayed on high-traffic public amenities where GPS is too coarse. Individual A requests a SARS-COV-2 test (using the App) and their positive test result triggers an instant notification to individuals who have been in close contact. The app advises isolation for the case (individual A) and quarantine of their contacts.[1] Numerous applications were developed or proposed, with official government support in some territories and jurisdictions. Several frameworks for building contact tracing apps have been developed. Privacy con